diff --git a/2018/sketch_180118a/DBN_Letters.pdf b/2018/sketch_180118a/DBN_Letters.pdf
index f6ac1fe1..8b49ea43 100644
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diff --git a/2018/sketch_180119a/DBN_Letters.pdf b/2018/sketch_180119a/DBN_Letters.pdf
deleted file mode 100644
index 3c2b5152..00000000
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diff --git a/2019/sketch_190421a/data/dbnletters.dbn b/2019/sketch_190421a/data/dbnletters.dbn
new file mode 100755
index 00000000..ff0cf4d4
--- /dev/null
+++ b/2019/sketch_190421a/data/dbnletters.dbn
@@ -0,0 +1,341 @@
+// dbnletters
+command letterA h v
+{
+  line h v h (v+7)
+  line (h) (v+7) (h+3) (v+10)
+  line (h+3) (v+10) (h+10) (v+3)
+  line (h+10) (v+3) (h+10) v
+  line h (v+3) (h+10) (v+3)
+}
+command letterB h v
+{
+  line h v h (v+10)
+  line h (v+10) (h+5) (v+10)
+  line (h+5) (v+10) (h+8) (v+7)
+  line h (v+6) (h+7) (v+6)
+  line (h+7) (v+6) (h+10) (v+3)
+  line (h+10) (v+3) (h+10) (v+1)
+  line h v (h+9) v
+}
+command letterC h v
+{
+  line (h+4) v (h+10) v
+  line (h+4) v h (v+4)
+  line h (v+4) h (v+9)
+  line (h+1) (v+10) (h+9) (v+10)
+}
+command letterD h v
+{
+  line h v h (v+10)
+  line h v (h+8) v
+  line (h+8) v (h+10) (v+2)
+  line (h+10) (v+2) (h+10) (v+6)
+  line (h+10) (v+6) (h+6) (v+10)
+  line (h+6) (v+10) h (v+10)
+}
+command letterE h v
+{
+  line h (v+3) h (v+10)
+  line h (v+3) (h+3) v
+  line (h+3) v (h+10) v
+  line h (v+6) (h+9) (v+6)
+  line h (v+10) (h+9) (v+10)
+}
+command letterF h v
+{
+  line h v h (v+10)
+  line h (v+6) (h+8) (v+6)
+  line h (v+10) (h+10) (v+10)
+}
+command letterG h v
+{
+  line (h+4) v (h+9) v
+  line (h+4) v h (v+4)
+  line h (v+4) h (v+9)
+  line (h+1) (v+10) (h+9) (v+10)
+  line (h+10) (v+1) (h+10) (v+5)
+  line (h+10) (v+5) (h+6) (v+5)
+}
+command letterH h v
+{
+  line h v h (v+10)
+  line h (v+4) (h+10) (v+4)
+  line (h+10) v (h+10) (v+10)
+}
+command letterI h v
+{
+  line h v (h+10) v
+  line (h+5) v (h+5) (v+10)
+  line h (v+10) (h+9) (v+10)
+}
+command letterJ h v
+{
+  line h (v+3) (h+3) v
+  line (h+3) v (h+9) v
+  line (h+10) (v+1) (h+10) (v+10)
+}
+command letterK h v
+{
+  line h v h (v+10)
+  line h (v+1) (h+9) (v+10)
+  line (h+5) (v+5) (h+10) v
+}
+command letterL h v
+{
+  line h v h (v+10)
+  line h v (h+10) v
+}
+command letterM h v
+{
+  line h v h (v+10)
+  //line h (v+10) (h+2) (v+10)
+  line (h+1) (v+10) (h+5) (v+6)
+  line (h+5) (v+6) (h+9) (v+10)
+  line (h+10) (v+10) (h+10) v
+}
+command letterN h v
+{
+  line h v h (v+10)
+  line h (v+10) (h+3) (v+10)
+  line (h+3) (v+10) (h+10) (v+3)
+  line (h+10) (v+10) (h+10) v
+}
+command letterO h v
+{
+  line (h+4) v (h+9) v
+  line (h+4) v h (v+4)
+  line h (v+4) h (v+9)
+  line (h+1) (v+10) (h+7) (v+10)
+  line (h+7) (v+10) (h+10) (v+7)
+  line (h+10) (v+7) (h+10) (v+1)
+}
+command letterP h v
+{
+  line h v h (v+10)
+  line h (v+10) (h+7) (v+10)
+  line (h+7) (v+10) (h+10) (v+7)
+  line (h+10) (v+6) (h+8) (v+4)
+  line h (v+4) (h+8) (v+4)
+}
+command letterQ h v
+{
+  line (h+4) v (h+8) v
+  line (h+4) v h (v+4)
+  line h (v+4) h (v+9)
+  line (h+1) (v+10) (h+7) (v+10)
+  line (h+7) (v+10) (h+10) (v+7)
+  line (h+10) (v+7) (h+10) (v+2)
+  line (h+6) (v+4) (h+10) v
+}
+command letterR h v
+{
+  line h v h (v+10)
+  line h (v+10) (h+7) (v+10)
+  line (h+7) (v+10) (h+10) (v+7)
+  line (h+10) (v+6) (h+8) (v+4)
+  line h (v+4) (h+8) (v+4)
+  line (h+6) (v+4) (h+10) v
+}
+command letterS h v
+{
+  line h (v+2) (h+2) v
+  line (h+2) v (h+9) v
+  line (h+10) (v+1) (h+10) (v+4)
+  line (h+9) (v+5) (h+2) (v+5)
+  line (h+2) (v+5) h (v+7)
+  line h (v+7) h (v+9)
+  line (h+1) (v+10) (h+9) (v+10)
+  line (h+9) (v+10) (h+10) (v+9)
+}
+command letterT h v
+{
+  line h (v+10) (h+10) (v+10)
+  line (h+5) (v+10) (h+5) v
+}
+command letterU h v
+{
+  line h (v+10) h (v+3)
+  line h (v+3) (h+3) v
+  line (h+3) v (h+9) v
+  line (h+10) (v+1) (h+10) (v+10)
+}
+command letterV h v
+{
+  line h (v+10) h (v+5)
+  line h (v+5) (h+5) v
+  line (h+5) v (h+10) (v+5)
+  line (h+10) (v+5) (h+10) (v+10)
+}
+command letterW h v
+{
+  line h (v+10) h (v+3)
+  line h (v+3) (h+3) v
+  line (h+3) v (h+6) (v+3)
+  line (h+6) (v+3) (h+9) v
+  line (h+10) (v+1) (h+10) (v+10)
+}
+command letterX h v
+{
+  line h (v+10) h (v+9)
+  line h (v+9) (h+4) (v+5)
+  line (h+4) (v+5) (h+6) (v+5)
+  line (h+6) (v+5) (h+10) (v+9)
+  line (h+10) (v+9) (h+10) (v+10)
+  line h v h (v+1)
+  line h (v+1) (h+4) (v+5)
+  line (h+6) (v+5) (h+10) (v+1)
+  line (h+10) (v+1) (h+10) v
+}
+command letterX2 h v // comment out to use the first option
+{
+  line h v (h+10) (v+10)
+  line h (v+10) (h+10) v
+}
+
+command letterY h v
+{
+  line h (v+10) h (v+7)
+  line h (v+7) (h+3) (v+4)
+  line (h+3) (v+4) (h+10) (v+4)
+  line (h+10) (v+10) (h+10) (v+1)
+  line (h+9) v (h+2) v
+  line (h+2) v h (v+2)
+}
+command letterZ h v
+{
+  line h (v+10) (h+10) (v+10)
+  line (h+10) (v+10) h v
+  line h v (h+10) v
+}
+command letter l h v
+{
+  same? l 1
+  {
+    letterA h v
+  }
+  same? l 2
+  {
+    letterB h v
+  }
+  same? l 3
+  {
+    letterC h v
+  }
+  same? l 4
+  {
+    letterD h v
+  }
+  same? l 5
+  {
+    letterE h v
+  }
+  same? l 6
+  {
+    letterF h v
+  }
+  same? l 7
+  {
+    letterG h v
+  }
+  same? l 8
+  {
+    letterH h v
+  }
+  same? l 9
+  {
+    letterI h v
+  }
+  same? l 10
+  {
+    letterJ h v
+  }
+  same? l 11
+  {
+    letterK h v
+  }
+  same? l 12
+  {
+    letterL h v
+  }
+  same? l 13
+  {
+    letterM h v
+  }
+  same? l 14
+  {
+    letterN h v
+  }
+  same? l 15
+  {
+    letterO h v
+  }
+  same? l 16
+  {
+    letterP h v
+  }
+  same? l 17
+  {
+    letterQ h v
+  }
+  same? l 18
+  {
+    letterR h v
+  }
+  same? l 19
+  {
+    letterS h v
+  }
+  same? l 20
+  {
+    letterT h v
+  }
+  same? l 21
+  {
+    letterU h v
+  }
+  same? l 22
+  {
+    letterV h v
+  }
+  same? l 23
+  {
+    letterW h v
+  }
+  same? l 24
+  {
+    letterX h v
+  }
+  same? l 25
+  {
+    letterY h v
+  }
+  same? l 26
+  {
+    letterZ h v
+  }
+}
+command testdbnletters
+{
+  paper 0
+  pen 100
+  set x 17
+  set y 73
+  set dx 12
+  set dy 12
+  set n 0
+  repeat a 1 25
+  {
+    letter a x y
+    set x (x+dx)
+    set n (n+1)
+    same? n 5
+    {
+      set x 17
+      set y (y-dy)
+      set n 0
+    }
+  }
+  set x (x+dx*5)
+  letter 26 x y
+}
+
diff --git a/2019/sketch_190421a/data/dbnletters_first_X_option.dbn b/2019/sketch_190421a/data/dbnletters_first_X_option.dbn
new file mode 100755
index 00000000..764983ed
--- /dev/null
+++ b/2019/sketch_190421a/data/dbnletters_first_X_option.dbn
@@ -0,0 +1,340 @@
+// dbnletters
+command letterA h v
+{
+  line h v h (v+7)
+  line (h) (v+7) (h+3) (v+10)
+  line (h+3) (v+10) (h+10) (v+3)
+  line (h+10) (v+3) (h+10) v
+  line h (v+3) (h+10) (v+3)
+}
+command letterB h v
+{
+  line h v h (v+10)
+  line h (v+10) (h+5) (v+10)
+  line (h+5) (v+10) (h+8) (v+7)
+  line h (v+6) (h+7) (v+6)
+  line (h+7) (v+6) (h+10) (v+3)
+  line (h+10) (v+3) (h+10) (v+1)
+  line h v (h+9) v
+}
+command letterC h v
+{
+  line (h+4) v (h+10) v
+  line (h+4) v h (v+4)
+  line h (v+4) h (v+9)
+  line (h+1) (v+10) (h+9) (v+10)
+}
+command letterD h v
+{
+  line h v h (v+10)
+  line h v (h+8) v
+  line (h+8) v (h+10) (v+2)
+  line (h+10) (v+2) (h+10) (v+6)
+  line (h+10) (v+6) (h+6) (v+10)
+  line (h+6) (v+10) h (v+10)
+}
+command letterE h v
+{
+  line h (v+3) h (v+10)
+  line h (v+3) (h+3) v
+  line (h+3) v (h+10) v
+  line h (v+6) (h+9) (v+6)
+  line h (v+10) (h+9) (v+10)
+}
+command letterF h v
+{
+  line h v h (v+10)
+  line h (v+6) (h+8) (v+6)
+  line h (v+10) (h+10) (v+10)
+}
+command letterG h v
+{
+  line (h+4) v (h+9) v
+  line (h+4) v h (v+4)
+  line h (v+4) h (v+9)
+  line (h+1) (v+10) (h+9) (v+10)
+  line (h+10) (v+1) (h+10) (v+5)
+  line (h+10) (v+5) (h+6) (v+5)
+}
+command letterH h v
+{
+  line h v h (v+10)
+  line h (v+4) (h+10) (v+4)
+  line (h+10) v (h+10) (v+10)
+}
+command letterI h v
+{
+  line h v (h+10) v
+  line (h+5) v (h+5) (v+10)
+  line h (v+10) (h+9) (v+10)
+}
+command letterJ h v
+{
+  line h (v+3) (h+3) v
+  line (h+3) v (h+9) v
+  line (h+10) (v+1) (h+10) (v+10)
+}
+command letterK h v
+{
+  line h v h (v+10)
+  line h (v+1) (h+9) (v+10)
+  line (h+5) (v+5) (h+10) v
+}
+command letterL h v
+{
+  line h v h (v+10)
+  line h v (h+10) v
+}
+command letterM h v
+{
+  line h v h (v+10)
+  //line h (v+10) (h+2) (v+10)
+  line (h+1) (v+10) (h+5) (v+6)
+  line (h+5) (v+6) (h+9) (v+10)
+  line (h+10) (v+10) (h+10) v
+}
+command letterN h v
+{
+  line h v h (v+10)
+  line h (v+10) (h+3) (v+10)
+  line (h+3) (v+10) (h+10) (v+3)
+  line (h+10) (v+10) (h+10) v
+}
+command letterO h v
+{
+  line (h+4) v (h+9) v
+  line (h+4) v h (v+4)
+  line h (v+4) h (v+9)
+  line (h+1) (v+10) (h+7) (v+10)
+  line (h+7) (v+10) (h+10) (v+7)
+  line (h+10) (v+7) (h+10) (v+1)
+}
+command letterP h v
+{
+  line h v h (v+10)
+  line h (v+10) (h+7) (v+10)
+  line (h+7) (v+10) (h+10) (v+7)
+  line (h+10) (v+6) (h+8) (v+4)
+  line h (v+4) (h+8) (v+4)
+}
+command letterQ h v
+{
+  line (h+4) v (h+8) v
+  line (h+4) v h (v+4)
+  line h (v+4) h (v+9)
+  line (h+1) (v+10) (h+7) (v+10)
+  line (h+7) (v+10) (h+10) (v+7)
+  line (h+10) (v+7) (h+10) (v+2)
+  line (h+6) (v+4) (h+10) v
+}
+command letterR h v
+{
+  line h v h (v+10)
+  line h (v+10) (h+7) (v+10)
+  line (h+7) (v+10) (h+10) (v+7)
+  line (h+10) (v+6) (h+8) (v+4)
+  line h (v+4) (h+8) (v+4)
+  line (h+6) (v+4) (h+10) v
+}
+command letterS h v
+{
+  line h (v+2) (h+2) v
+  line (h+2) v (h+9) v
+  line (h+10) (v+1) (h+10) (v+4)
+  line (h+9) (v+5) (h+2) (v+5)
+  line (h+2) (v+5) h (v+7)
+  line h (v+7) h (v+9)
+  line (h+1) (v+10) (h+9) (v+10)
+  line (h+9) (v+10) (h+10) (v+9)
+}
+command letterT h v
+{
+  line h (v+10) (h+10) (v+10)
+  line (h+5) (v+10) (h+5) v
+}
+command letterU h v
+{
+  line h (v+10) h (v+3)
+  line h (v+3) (h+3) v
+  line (h+3) v (h+9) v
+  line (h+10) (v+1) (h+10) (v+10)
+}
+command letterV h v
+{
+  line h (v+10) h (v+5)
+  line h (v+5) (h+5) v
+  line (h+5) v (h+10) (v+5)
+  line (h+10) (v+5) (h+10) (v+10)
+}
+command letterW h v
+{
+  line h (v+10) h (v+3)
+  line h (v+3) (h+3) v
+  line (h+3) v (h+6) (v+3)
+  line (h+6) (v+3) (h+9) v
+  line (h+10) (v+1) (h+10) (v+10)
+}
+command letterX h v
+{
+  line h (v+10) h (v+9)
+  line h (v+9) (h+4) (v+5)
+  line (h+4) (v+5) (h+6) (v+5)
+  line (h+6) (v+5) (h+10) (v+9)
+  line (h+10) (v+9) (h+10) (v+10)
+  line h v h (v+1)
+  line h (v+1) (h+4) (v+5)
+  line (h+6) (v+5) (h+10) (v+1)
+  line (h+10) (v+1) (h+10) v
+}
+//command letterX2 h v // comment out to use the first option
+//{
+//  line h v (h+10) (v+10)
+//  line h (v+10) (h+10) v
+//}
+command letterY h v
+{
+  line h (v+10) h (v+7)
+  line h (v+7) (h+3) (v+4)
+  line (h+3) (v+4) (h+10) (v+4)
+  line (h+10) (v+10) (h+10) (v+1)
+  line (h+9) v (h+2) v
+  line (h+2) v h (v+2)
+}
+command letterZ h v
+{
+  line h (v+10) (h+10) (v+10)
+  line (h+10) (v+10) h v
+  line h v (h+10) v
+}
+command letter l h v
+{
+  same? l 1
+  {
+    letterA h v
+  }
+  same? l 2
+  {
+    letterB h v
+  }
+  same? l 3
+  {
+    letterC h v
+  }
+  same? l 4
+  {
+    letterD h v
+  }
+  same? l 5
+  {
+    letterE h v
+  }
+  same? l 6
+  {
+    letterF h v
+  }
+  same? l 7
+  {
+    letterG h v
+  }
+  same? l 8
+  {
+    letterH h v
+  }
+  same? l 9
+  {
+    letterI h v
+  }
+  same? l 10
+  {
+    letterJ h v
+  }
+  same? l 11
+  {
+    letterK h v
+  }
+  same? l 12
+  {
+    letterL h v
+  }
+  same? l 13
+  {
+    letterM h v
+  }
+  same? l 14
+  {
+    letterN h v
+  }
+  same? l 15
+  {
+    letterO h v
+  }
+  same? l 16
+  {
+    letterP h v
+  }
+  same? l 17
+  {
+    letterQ h v
+  }
+  same? l 18
+  {
+    letterR h v
+  }
+  same? l 19
+  {
+    letterS h v
+  }
+  same? l 20
+  {
+    letterT h v
+  }
+  same? l 21
+  {
+    letterU h v
+  }
+  same? l 22
+  {
+    letterV h v
+  }
+  same? l 23
+  {
+    letterW h v
+  }
+  same? l 24
+  {
+    letterX h v
+  }
+  same? l 25
+  {
+    letterY h v
+  }
+  same? l 26
+  {
+    letterZ h v
+  }
+}
+command testdbnletters
+{
+  paper 0
+  pen 100
+  set x 17
+  set y 73
+  set dx 12
+  set dy 12
+  set n 0
+  repeat a 1 25
+  {
+    letter a x y
+    set x (x+dx)
+    set n (n+1)
+    same? n 5
+    {
+      set x 17
+      set y (y-dy)
+      set n 0
+    }
+  }
+  set x (x+dx*5)
+  letter 26 x y
+}
+
diff --git a/2019/sketch_190421a/dbn_generate_letters.py b/2019/sketch_190421a/dbn_generate_letters.py
new file mode 100644
index 00000000..75fa7821
--- /dev/null
+++ b/2019/sketch_190421a/dbn_generate_letters.py
@@ -0,0 +1,63 @@
+"""
+Alexandre B A Villares
+https://abav.lugaralgum.com/sketch-a-day
+
+This script generates dbn_letterss.py
+
+Converting some of Maeda's Design by Number
+dbnletters.dbn code -> Processing
+"""
+
+def convert_dbn_source_letters(file_path):
+    with open("dbn_letters.py", 'w') as out:
+        out.write('"""\n')
+        out.write("Alexandre B A Villares\n")
+        out.write("https://abav.lugaralgum.com/sketch-a-day\n")
+        out.write("This code was generated by dbn_generate_letters.py\n")
+        out.write("Converting some of Maeda's Design by Number\n")
+        out.write('dbnletters.dbn code -> Processing\n"""\n')
+        out.write("dbn_letter = {}  # Dict of functions\n")
+        out.write("\n")
+    with open(file_path, "r") as f:
+        dbn_source = f.readlines()
+    inside_block = False
+    command_name = ""
+    command_block = []
+    for ln in dbn_source:
+        if ln.count("command"):
+            command_name = ln[14:15]
+        elif ln.count("{"):
+            inside_block = True
+        elif ln.count("}"):
+            if command_name in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
+                def_dbn_letter(command_block, command_name)
+            command_block = []  # empty block
+            inside_block = False
+        elif inside_block:
+            command_block.append(ln.lstrip())
+
+def def_dbn_letter(dbn_block, key_):
+    p_block = []
+    for dbn_line in dbn_block:
+        if dbn_line:
+            # for debug
+            p_block.append("    if debug_poly: stroke(random(256),200, 200)\n")
+            p_block.append("    " + dbn_line
+                           .replace("line ", "line(")
+                           .replace(" ", ",")
+                           .replace("//", "#")
+                           .strip()
+                           + ")\n")
+    with open("dbn_letters.py", 'a') as out:
+        out.write("# " + key_ + "\n")
+        out.write("def dbn_letter" + key_ + "(h, v, debug_poly=False):\n")
+        out.write("    pushMatrix()\n")
+        out.write("    scale(1, -1)\n")
+        for py_processing_line in p_block:
+            out.write(py_processing_line)
+        out.write("    popMatrix()\n")
+        out.write("dbn_letter['" + key_ + "'] = dbn_letter" + key_ + "\n")
+        out.write("dbn_letter[" + str(ord(key_) - 64)
+                  + "] = dbn_letter" + key_ + "\n")
+    
+    
diff --git a/2019/sketch_190421a/dbn_generate_polys.py b/2019/sketch_190421a/dbn_generate_polys.py
new file mode 100644
index 00000000..096d0a43
--- /dev/null
+++ b/2019/sketch_190421a/dbn_generate_polys.py
@@ -0,0 +1,84 @@
+"""
+Alexandre B A Villares
+https://abav.lugaralgum.com/sketch-a-day
+
+This script generates dbn_polys.py
+
+Converting some of Maeda's Design by Number
+dbnletters.dbn code -> Processing
+"""
+    
+def convert_dbn_source_polys(file_path):
+    with open("dbn_polys.py", 'w') as out:
+        out.write('"""\n')
+        out.write("Alexandre B A Villares\n")
+        out.write("https://abav.lugaralgum.com/sketch-a-day\n")
+        out.write("This code was generated by dbn_generate_polys.py\n")
+        out.write("Converting some of Maeda's Design by Number\n")
+        out.write('dbnletters.dbn code -> Processing\n"""\n')
+        out.write("dbn_p_letter = {}  # Dict of functions\n")
+        out.write("\n")
+    with open(file_path, "r") as f:
+        dbn_source = f.readlines()
+    inside_block = False
+    command_name = ""
+    command_block = []
+    for ln in dbn_source:
+        if ln.count("command"):
+            command_name = ln[14:15]
+        elif ln.count("{"):
+            inside_block = True
+        elif ln.count("}"):
+            if command_name in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
+                def_dbn_p_letter(command_block, command_name)
+            command_block = []  # empty block
+            inside_block = False
+        elif inside_block:
+            command_block.append(ln.lstrip())
+
+
+def def_dbn_p_letter(dbn_block, key_):
+    p_block = []
+
+    for dbn_line in dbn_block:
+        if dbn_line:
+            p_lines =("    " + dbn_line       # all this to convert lines() to shapes
+                           .replace("(", "") 
+                           .replace(")", "")
+                           .replace("line ", "vertex(")
+                           .replace(" ", ",", 1)
+                           .replace(" ", "$", 1)  # token to split line into 2 vertices
+                           .replace(" ", ",")
+                           .replace("$", ")\n    vertex(", 1)
+                           .replace("//", "#")
+                           .strip()
+                           + ")")
+            p_block.append(p_lines.split("\n")[0]) 
+            p_block.append(p_lines.split("\n")[1])
+    # for ln in p_block:
+    #     print ln.replace(" ","-")
+            
+    with open("dbn_polys.py", 'a') as out:
+        out.write("# " + key_ + "\n")
+        out.write("def dbn_p_letter" + key_ + "(h, v, debug_poly=False):\n")
+        out.write("    pushMatrix()\n")
+        out.write("    scale(1, -1)\n")
+        out.write("    if debug_poly: stroke(random(256),200, 200)\n") # for debug
+        out.write("    beginShape()\n")
+        v_count = 0
+        for i, line_ in enumerate(p_block):
+            if line_ != p_block[i-1]: # and line_ != p_block[i-2]: # if repeated
+                out.write(line_ + "\n")
+                v_count += 1
+            else: out.write("    # " + line_.lstrip() + "\n")
+            if i % 2 and i < len(p_block)-2:  # if on odd lines, next doesn't repeat
+                if line_ != p_block[i+1]:
+                    #out.write("    #---\n")
+                    out.write("    endShape()\n")
+                    out.write("    if debug_poly: stroke(random(256),200, 200)\n") # for debug
+                    out.write("    beginShape()\n")                        
+        out.write("    endShape()\n")
+        out.write("    popMatrix()\n")
+        out.write("dbn_p_letter['" + key_ + "'] = dbn_p_letter" + key_ + "\n")
+        out.write("dbn_p_letter[" + str(ord(key_) - 64)
+                  + "] = dbn_p_letter" + key_ + "\n")
diff --git a/2019/sketch_190421a/dbn_letters.py b/2019/sketch_190421a/dbn_letters.py
new file mode 100644
index 00000000..77aed490
--- /dev/null
+++ b/2019/sketch_190421a/dbn_letters.py
@@ -0,0 +1,450 @@
+"""
+Alexandre B A Villares
+https://abav.lugaralgum.com/sketch-a-day
+This code was generated by dbn_generate_letters.py
+Converting some of Maeda's Design by Number
+dbnletters.dbn code -> Processing
+"""
+dbn_letter = {}  # Dict of functions
+
+# A
+def dbn_letterA(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+7))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h),(v+7),(h+3),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+3),(v+10),(h+10),(v+3))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+3),(h+10),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+3),(h+10),(v+3))
+    popMatrix()
+dbn_letter['A'] = dbn_letterA
+dbn_letter[1] = dbn_letterA
+# B
+def dbn_letterB(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+5),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+5),(v+10),(h+8),(v+7))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+6),(h+7),(v+6))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+7),(v+6),(h+10),(v+3))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+3),(h+10),(v+1))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,(h+9),v)
+    popMatrix()
+dbn_letter['B'] = dbn_letterB
+dbn_letter[2] = dbn_letterB
+# C
+def dbn_letterC(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+4),v,(h+10),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+4),v,h,(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+4),h,(v+9))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+1),(v+10),(h+9),(v+10))
+    popMatrix()
+dbn_letter['C'] = dbn_letterC
+dbn_letter[3] = dbn_letterC
+# D
+def dbn_letterD(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,(h+8),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+8),v,(h+10),(v+2))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+2),(h+10),(v+6))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+6),(h+6),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+6),(v+10),h,(v+10))
+    popMatrix()
+dbn_letter['D'] = dbn_letterD
+dbn_letter[4] = dbn_letterD
+# E
+def dbn_letterE(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+3),h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+3),(h+3),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+3),v,(h+10),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+6),(h+9),(v+6))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+9),(v+10))
+    popMatrix()
+dbn_letter['E'] = dbn_letterE
+dbn_letter[5] = dbn_letterE
+# F
+def dbn_letterF(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+6),(h+8),(v+6))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+10),(v+10))
+    popMatrix()
+dbn_letter['F'] = dbn_letterF
+dbn_letter[6] = dbn_letterF
+# G
+def dbn_letterG(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+4),v,(h+9),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+4),v,h,(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+4),h,(v+9))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+1),(v+10),(h+9),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+1),(h+10),(v+5))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+5),(h+6),(v+5))
+    popMatrix()
+dbn_letter['G'] = dbn_letterG
+dbn_letter[7] = dbn_letterG
+# H
+def dbn_letterH(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+4),(h+10),(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),v,(h+10),(v+10))
+    popMatrix()
+dbn_letter['H'] = dbn_letterH
+dbn_letter[8] = dbn_letterH
+# I
+def dbn_letterI(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,(h+10),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+5),v,(h+5),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+9),(v+10))
+    popMatrix()
+dbn_letter['I'] = dbn_letterI
+dbn_letter[9] = dbn_letterI
+# J
+def dbn_letterJ(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+3),(h+3),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+3),v,(h+9),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+1),(h+10),(v+10))
+    popMatrix()
+dbn_letter['J'] = dbn_letterJ
+dbn_letter[10] = dbn_letterJ
+# K
+def dbn_letterK(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+1),(h+9),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+5),(v+5),(h+10),v)
+    popMatrix()
+dbn_letter['K'] = dbn_letterK
+dbn_letter[11] = dbn_letterK
+# L
+def dbn_letterL(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,(h+10),v)
+    popMatrix()
+dbn_letter['L'] = dbn_letterL
+dbn_letter[12] = dbn_letterL
+# M
+def dbn_letterM(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    #line(h,(v+10),(h+2),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+1),(v+10),(h+5),(v+6))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+5),(v+6),(h+9),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+10),(h+10),v)
+    popMatrix()
+dbn_letter['M'] = dbn_letterM
+dbn_letter[13] = dbn_letterM
+# N
+def dbn_letterN(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+3),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+3),(v+10),(h+10),(v+3))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+10),(h+10),v)
+    popMatrix()
+dbn_letter['N'] = dbn_letterN
+dbn_letter[14] = dbn_letterN
+# O
+def dbn_letterO(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+4),v,(h+9),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+4),v,h,(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+4),h,(v+9))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+1),(v+10),(h+7),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+7),(v+10),(h+10),(v+7))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+7),(h+10),(v+1))
+    popMatrix()
+dbn_letter['O'] = dbn_letterO
+dbn_letter[15] = dbn_letterO
+# P
+def dbn_letterP(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+7),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+7),(v+10),(h+10),(v+7))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+6),(h+8),(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+4),(h+8),(v+4))
+    popMatrix()
+dbn_letter['P'] = dbn_letterP
+dbn_letter[16] = dbn_letterP
+# Q
+def dbn_letterQ(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+4),v,(h+8),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+4),v,h,(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+4),h,(v+9))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+1),(v+10),(h+7),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+7),(v+10),(h+10),(v+7))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+7),(h+10),(v+2))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+6),(v+4),(h+10),v)
+    popMatrix()
+dbn_letter['Q'] = dbn_letterQ
+dbn_letter[17] = dbn_letterQ
+# R
+def dbn_letterR(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+7),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+7),(v+10),(h+10),(v+7))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+6),(h+8),(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+4),(h+8),(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+6),(v+4),(h+10),v)
+    popMatrix()
+dbn_letter['R'] = dbn_letterR
+dbn_letter[18] = dbn_letterR
+# S
+def dbn_letterS(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+2),(h+2),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+2),v,(h+9),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+1),(h+10),(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+9),(v+5),(h+2),(v+5))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+2),(v+5),h,(v+7))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+7),h,(v+9))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+1),(v+10),(h+9),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+9),(v+10),(h+10),(v+9))
+    popMatrix()
+dbn_letter['S'] = dbn_letterS
+dbn_letter[19] = dbn_letterS
+# T
+def dbn_letterT(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+10),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+5),(v+10),(h+5),v)
+    popMatrix()
+dbn_letter['T'] = dbn_letterT
+dbn_letter[20] = dbn_letterT
+# U
+def dbn_letterU(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),h,(v+3))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+3),(h+3),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+3),v,(h+9),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+1),(h+10),(v+10))
+    popMatrix()
+dbn_letter['U'] = dbn_letterU
+dbn_letter[21] = dbn_letterU
+# V
+def dbn_letterV(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),h,(v+5))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+5),(h+5),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+5),v,(h+10),(v+5))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+5),(h+10),(v+10))
+    popMatrix()
+dbn_letter['V'] = dbn_letterV
+dbn_letter[22] = dbn_letterV
+# W
+def dbn_letterW(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),h,(v+3))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+3),(h+3),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+3),v,(h+6),(v+3))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+6),(v+3),(h+9),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+1),(h+10),(v+10))
+    popMatrix()
+dbn_letter['W'] = dbn_letterW
+dbn_letter[23] = dbn_letterW
+# X
+def dbn_letterX(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),h,(v+9))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+9),(h+4),(v+5))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+4),(v+5),(h+6),(v+5))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+6),(v+5),(h+10),(v+9))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+9),(h+10),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,h,(v+1))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+1),(h+4),(v+5))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+6),(v+5),(h+10),(v+1))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+1),(h+10),v)
+    popMatrix()
+dbn_letter['X'] = dbn_letterX
+dbn_letter[24] = dbn_letterX
+# X
+def dbn_letterX(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,(h+10),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+10),v)
+    popMatrix()
+dbn_letter['X'] = dbn_letterX
+dbn_letter[24] = dbn_letterX
+# Y
+def dbn_letterY(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),h,(v+7))
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+7),(h+3),(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+3),(v+4),(h+10),(v+4))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+10),(h+10),(v+1))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+9),v,(h+2),v)
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+2),v,h,(v+2))
+    popMatrix()
+dbn_letter['Y'] = dbn_letterY
+dbn_letter[25] = dbn_letterY
+# Z
+def dbn_letterZ(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,(v+10),(h+10),(v+10))
+    if debug_poly: stroke(random(256),200, 200)
+    line((h+10),(v+10),h,v)
+    if debug_poly: stroke(random(256),200, 200)
+    line(h,v,(h+10),v)
+    popMatrix()
+dbn_letter['Z'] = dbn_letterZ
+dbn_letter[26] = dbn_letterZ
diff --git a/2019/sketch_190421a/dbn_polys.py b/2019/sketch_190421a/dbn_polys.py
new file mode 100644
index 00000000..1bf9a87e
--- /dev/null
+++ b/2019/sketch_190421a/dbn_polys.py
@@ -0,0 +1,672 @@
+"""
+Alexandre B A Villares
+https://abav.lugaralgum.com/sketch-a-day
+This code was generated by dbn_generate_polys.py
+Converting some of Maeda's Design by Number
+dbnletters.dbn code -> Processing
+"""
+dbn_p_letter = {}  # Dict of functions
+
+# A
+def dbn_p_letterA(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+7)
+    # vertex(h,v+7)
+    vertex(h+3,v+10)
+    # vertex(h+3,v+10)
+    vertex(h+10,v+3)
+    # vertex(h+10,v+3)
+    vertex(h+10,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+3)
+    vertex(h+10,v+3)
+    endShape()
+    popMatrix()
+dbn_p_letter['A'] = dbn_p_letterA
+dbn_p_letter[1] = dbn_p_letterA
+# B
+def dbn_p_letterB(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    # vertex(h,v+10)
+    vertex(h+5,v+10)
+    # vertex(h+5,v+10)
+    vertex(h+8,v+7)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+6)
+    vertex(h+7,v+6)
+    # vertex(h+7,v+6)
+    vertex(h+10,v+3)
+    # vertex(h+10,v+3)
+    vertex(h+10,v+1)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h+9,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['B'] = dbn_p_letterB
+dbn_p_letter[2] = dbn_p_letterB
+# C
+def dbn_p_letterC(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+4,v)
+    vertex(h+10,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+4,v)
+    vertex(h,v+4)
+    # vertex(h,v+4)
+    vertex(h,v+9)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+1,v+10)
+    vertex(h+9,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['C'] = dbn_p_letterC
+dbn_p_letter[3] = dbn_p_letterC
+# D
+def dbn_p_letterD(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h+8,v)
+    # vertex(h+8,v)
+    vertex(h+10,v+2)
+    # vertex(h+10,v+2)
+    vertex(h+10,v+6)
+    # vertex(h+10,v+6)
+    vertex(h+6,v+10)
+    # vertex(h+6,v+10)
+    vertex(h,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['D'] = dbn_p_letterD
+dbn_p_letter[4] = dbn_p_letterD
+# E
+def dbn_p_letterE(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+3)
+    vertex(h,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+3)
+    vertex(h+3,v)
+    # vertex(h+3,v)
+    vertex(h+10,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+6)
+    vertex(h+9,v+6)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h+9,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['E'] = dbn_p_letterE
+dbn_p_letter[5] = dbn_p_letterE
+# F
+def dbn_p_letterF(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+6)
+    vertex(h+8,v+6)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h+10,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['F'] = dbn_p_letterF
+dbn_p_letter[6] = dbn_p_letterF
+# G
+def dbn_p_letterG(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+4,v)
+    vertex(h+9,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+4,v)
+    vertex(h,v+4)
+    # vertex(h,v+4)
+    vertex(h,v+9)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+1,v+10)
+    vertex(h+9,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+1)
+    vertex(h+10,v+5)
+    # vertex(h+10,v+5)
+    vertex(h+6,v+5)
+    endShape()
+    popMatrix()
+dbn_p_letter['G'] = dbn_p_letterG
+dbn_p_letter[7] = dbn_p_letterG
+# H
+def dbn_p_letterH(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+4)
+    vertex(h+10,v+4)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v)
+    vertex(h+10,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['H'] = dbn_p_letterH
+dbn_p_letter[8] = dbn_p_letterH
+# I
+def dbn_p_letterI(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h+10,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+5,v)
+    vertex(h+5,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h+9,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['I'] = dbn_p_letterI
+dbn_p_letter[9] = dbn_p_letterI
+# J
+def dbn_p_letterJ(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+3)
+    vertex(h+3,v)
+    # vertex(h+3,v)
+    vertex(h+9,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+1)
+    vertex(h+10,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['J'] = dbn_p_letterJ
+dbn_p_letter[10] = dbn_p_letterJ
+# K
+def dbn_p_letterK(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+1)
+    vertex(h+9,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+5,v+5)
+    vertex(h+10,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['K'] = dbn_p_letterK
+dbn_p_letter[11] = dbn_p_letterK
+# L
+def dbn_p_letterL(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h+10,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['L'] = dbn_p_letterL
+dbn_p_letter[12] = dbn_p_letterL
+# M
+def dbn_p_letterM(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    #vertex(h,v+10)
+    vertex(h+2,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+1,v+10)
+    vertex(h+5,v+6)
+    # vertex(h+5,v+6)
+    vertex(h+9,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+10)
+    vertex(h+10,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['M'] = dbn_p_letterM
+dbn_p_letter[13] = dbn_p_letterM
+# N
+def dbn_p_letterN(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    # vertex(h,v+10)
+    vertex(h+3,v+10)
+    # vertex(h+3,v+10)
+    vertex(h+10,v+3)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+10)
+    vertex(h+10,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['N'] = dbn_p_letterN
+dbn_p_letter[14] = dbn_p_letterN
+# O
+def dbn_p_letterO(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+4,v)
+    vertex(h+9,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+4,v)
+    vertex(h,v+4)
+    # vertex(h,v+4)
+    vertex(h,v+9)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+1,v+10)
+    vertex(h+7,v+10)
+    # vertex(h+7,v+10)
+    vertex(h+10,v+7)
+    # vertex(h+10,v+7)
+    vertex(h+10,v+1)
+    endShape()
+    popMatrix()
+dbn_p_letter['O'] = dbn_p_letterO
+dbn_p_letter[15] = dbn_p_letterO
+# P
+def dbn_p_letterP(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    # vertex(h,v+10)
+    vertex(h+7,v+10)
+    # vertex(h+7,v+10)
+    vertex(h+10,v+7)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+6)
+    vertex(h+8,v+4)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+4)
+    vertex(h+8,v+4)
+    endShape()
+    popMatrix()
+dbn_p_letter['P'] = dbn_p_letterP
+dbn_p_letter[16] = dbn_p_letterP
+# Q
+def dbn_p_letterQ(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+4,v)
+    vertex(h+8,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+4,v)
+    vertex(h,v+4)
+    # vertex(h,v+4)
+    vertex(h,v+9)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+1,v+10)
+    vertex(h+7,v+10)
+    # vertex(h+7,v+10)
+    vertex(h+10,v+7)
+    # vertex(h+10,v+7)
+    vertex(h+10,v+2)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+6,v+4)
+    vertex(h+10,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['Q'] = dbn_p_letterQ
+dbn_p_letter[17] = dbn_p_letterQ
+# R
+def dbn_p_letterR(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+10)
+    # vertex(h,v+10)
+    vertex(h+7,v+10)
+    # vertex(h+7,v+10)
+    vertex(h+10,v+7)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+6)
+    vertex(h+8,v+4)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+4)
+    vertex(h+8,v+4)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+6,v+4)
+    vertex(h+10,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['R'] = dbn_p_letterR
+dbn_p_letter[18] = dbn_p_letterR
+# S
+def dbn_p_letterS(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+2)
+    vertex(h+2,v)
+    # vertex(h+2,v)
+    vertex(h+9,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+1)
+    vertex(h+10,v+4)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+9,v+5)
+    vertex(h+2,v+5)
+    # vertex(h+2,v+5)
+    vertex(h,v+7)
+    # vertex(h,v+7)
+    vertex(h,v+9)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+1,v+10)
+    vertex(h+9,v+10)
+    # vertex(h+9,v+10)
+    vertex(h+10,v+9)
+    endShape()
+    popMatrix()
+dbn_p_letter['S'] = dbn_p_letterS
+dbn_p_letter[19] = dbn_p_letterS
+# T
+def dbn_p_letterT(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h+10,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+5,v+10)
+    vertex(h+5,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['T'] = dbn_p_letterT
+dbn_p_letter[20] = dbn_p_letterT
+# U
+def dbn_p_letterU(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h,v+3)
+    # vertex(h,v+3)
+    vertex(h+3,v)
+    # vertex(h+3,v)
+    vertex(h+9,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+1)
+    vertex(h+10,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['U'] = dbn_p_letterU
+dbn_p_letter[21] = dbn_p_letterU
+# V
+def dbn_p_letterV(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h,v+5)
+    # vertex(h,v+5)
+    vertex(h+5,v)
+    # vertex(h+5,v)
+    vertex(h+10,v+5)
+    # vertex(h+10,v+5)
+    vertex(h+10,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['V'] = dbn_p_letterV
+dbn_p_letter[22] = dbn_p_letterV
+# W
+def dbn_p_letterW(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h,v+3)
+    # vertex(h,v+3)
+    vertex(h+3,v)
+    # vertex(h+3,v)
+    vertex(h+6,v+3)
+    # vertex(h+6,v+3)
+    vertex(h+9,v)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+1)
+    vertex(h+10,v+10)
+    endShape()
+    popMatrix()
+dbn_p_letter['W'] = dbn_p_letterW
+dbn_p_letter[23] = dbn_p_letterW
+# X
+def dbn_p_letterX(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h,v+9)
+    # vertex(h,v+9)
+    vertex(h+4,v+5)
+    # vertex(h+4,v+5)
+    vertex(h+6,v+5)
+    # vertex(h+6,v+5)
+    vertex(h+10,v+9)
+    # vertex(h+10,v+9)
+    vertex(h+10,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h,v+1)
+    # vertex(h,v+1)
+    vertex(h+4,v+5)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+6,v+5)
+    vertex(h+10,v+1)
+    # vertex(h+10,v+1)
+    vertex(h+10,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['X'] = dbn_p_letterX
+dbn_p_letter[24] = dbn_p_letterX
+# X
+def dbn_p_letterX(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v)
+    vertex(h+10,v+10)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h+10,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['X'] = dbn_p_letterX
+dbn_p_letter[24] = dbn_p_letterX
+# Y
+def dbn_p_letterY(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h,v+7)
+    # vertex(h,v+7)
+    vertex(h+3,v+4)
+    # vertex(h+3,v+4)
+    vertex(h+10,v+4)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+10,v+10)
+    vertex(h+10,v+1)
+    endShape()
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h+9,v)
+    vertex(h+2,v)
+    # vertex(h+2,v)
+    vertex(h,v+2)
+    endShape()
+    popMatrix()
+dbn_p_letter['Y'] = dbn_p_letterY
+dbn_p_letter[25] = dbn_p_letterY
+# Z
+def dbn_p_letterZ(h, v, debug_poly=False):
+    pushMatrix()
+    scale(1, -1)
+    if debug_poly: stroke(random(256),200, 200)
+    beginShape()
+    vertex(h,v+10)
+    vertex(h+10,v+10)
+    # vertex(h+10,v+10)
+    vertex(h,v)
+    # vertex(h,v)
+    vertex(h+10,v)
+    endShape()
+    popMatrix()
+dbn_p_letter['Z'] = dbn_p_letterZ
+dbn_p_letter[26] = dbn_p_letterZ
diff --git a/2019/sketch_190421a/sketch_190421a.png b/2019/sketch_190421a/sketch_190421a.png
new file mode 100644
index 00000000..1d3401f3
Binary files /dev/null and b/2019/sketch_190421a/sketch_190421a.png differ
diff --git a/2019/sketch_190421a/sketch_190421a.pyde b/2019/sketch_190421a/sketch_190421a.pyde
new file mode 100644
index 00000000..e4820e03
--- /dev/null
+++ b/2019/sketch_190421a/sketch_190421a.pyde
@@ -0,0 +1,55 @@
+"""
+Alexandre B A Villares
+https://abav.lugaralgum.com/sketch-a-day
+
+Converting some of Maeda's Design by Number
+dbnletters.dbn code -> Processing
+"""
+from dbn_generate_letters import convert_dbn_source_letters
+from dbn_generate_polys import convert_dbn_source_polys
+
+from dbn_letters import *
+from dbn_polys import *
+
+debug_poly = True
+
+def setup():
+    colorMode(HSB)
+    size(800, 400)
+    fill(0)
+    text("Press 't' tto draw letters, and to generate code press 'g'(lines) or 'G'(polys)", 10, 20)
+
+def keyPressed():
+    global debug_poly
+    if key == 'g':
+        convert_dbn_source_letters("data/dbnletters.dbn")
+    if key == 'G':
+        convert_dbn_source_polys("data/dbnletters.dbn")
+    if key == 't':
+        dbn_test()
+    if key == 'd':
+        debug_poly = not debug_poly
+        println("debug mode: " + repr(debug_poly))
+        stroke(0)
+    if key == "s":
+        saveFrame("###.png")
+
+def draw():
+    scale(4, 4)
+
+def dbn_test():
+    background(200)
+    noFill()
+    pushMatrix()
+    strokeCap(ROUND)
+    for y in range(0, 5):
+        for x in range(1, 6):
+            dbn_letter[x + y * 5](x * 12, -20 - y * 12, debug_poly)
+    dbn_letterZ(x * 12 + 12, -32 - y * 12)
+    translate(100, 0)   
+    strokeCap(PROJECT)
+    for y in range(0, 5):
+        for x in range(1, 6):
+            dbn_p_letter[x + y * 5](x * 12, -20 - y * 12, debug_poly)
+    dbn_letterZ(x * 12 + 12, -32 - y * 12)
+    popMatrix()
diff --git a/README.md b/README.md
index cbf6fba5..376ea1f1 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,16 @@ Get updates from my sort-of-weekly newsletter: [[sketch-mail](https://villares.o
 
 ---
 
+![sketch_190421a](2019/sketch_190420a/sketch_190421a.png)
+
+[sketch_190421](https://github.com/villares/sketch-a-day/tree/master/2019/sketch_190420a) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]
+
+This clean up of my Design By Numbers studies from last year will count as today's sketch :)
+
+Check out the other pieces, pixel and scalable fonts I created here: http://github.com/villares/DesignByNumbers-alphabet
+
+---
+
 ![sketch_190420a](2019/sketch_190420a/sketch_190420a.gif)
 
 [sketch_190420a](https://github.com/villares/sketch-a-day/tree/master/2019/sketch_190420a) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)]