diff --git a/2019/sketch_190517a/sketch_190517a.pyde b/2019/sketch_190517a/sketch_190517a.pyde
index 4853a87e..9425af0f 100644
--- a/2019/sketch_190517a/sketch_190517a.pyde
+++ b/2019/sketch_190517a/sketch_190517a.pyde
@@ -28,16 +28,14 @@ def setup():
     global grid_list, rad_list
     size(700, 700)
     W, H = 700, 700
-    X_LIST = [x for x in range(MARGIN, 1 + W - MARGIN, SPACING)]
-    Y_LIST = [y for y in range(MARGIN, 1 + H - MARGIN, SPACING)]
-    print X_LIST
-    grid_list = []
-    for x in X_LIST:
-        for y in Y_LIST:
-            grid_list.append((x, y))
-    grid_list.pop(len(grid_list) // 2)
-    rad_list = [20, 40, 60, 80, 100, 120, 140, 160] 
     
+    grid_list = []
+    for x in range(MARGIN, 1 + W - MARGIN, SPACING):
+        for y in range(MARGIN, 1 + H - MARGIN, SPACING):
+            grid_list.append((x, y))
+    grid_list.pop(len(grid_list) // 2) # 8 pos, 9 minus the middle pos
+    rad_list = list(range(20, 161, 20)) # 8: 20, 40, 60, ... 160
+
     create_grid(grid_list, rad_list)
     
     
diff --git a/2019/sketch_190517b/sketch_190517b.pyde b/2019/sketch_190517b/sketch_190517b.pyde
index 7a54308e..34cd8f28 100644
--- a/2019/sketch_190517b/sketch_190517b.pyde
+++ b/2019/sketch_190517b/sketch_190517b.pyde
@@ -8,7 +8,7 @@ from gif_exporter import gif_export
 
 SPACING, MARGIN = 100, 250
 grid = []
-N = 8
+N = 8 
 
 combinations = ((0, 1, 2), (0, 1, 3), (0, 1, 4), (0, 1, 5),
                 (0, 1, 6), (0, 1, 7), (0, 2, 3), (0, 2, 4),
@@ -28,19 +28,16 @@ def setup():
     global grid_list, rad_list
     size(700, 700)
     W, H = 700, 700
-    X_LIST = [x for x in range(MARGIN, 1 + W - MARGIN, SPACING)]
-    Y_LIST = [y for y in range(MARGIN, 1 + H - MARGIN, SPACING)]
-    print X_LIST
+    
     grid_list = []
-    for x in X_LIST:
-        for y in Y_LIST:
+    for x in range(MARGIN, 1 + W - MARGIN, SPACING):
+        for y in range(MARGIN, 1 + H - MARGIN, SPACING):
             grid_list.append((x, y))
-    grid_list.pop(len(grid_list) // 2)
-    rad_list = [20, 40, 60, 80, 100, 120, 140, 160] 
-    
+    grid_list.pop(len(grid_list) // 2) # 8 pos, 9 minus the middle pos
+    rad_list = list(range(20, 161, 20)) # 8: 20, 40, 60, ... 160
+
     create_grid(grid_list, rad_list)
     
-    
 
 def create_grid(grid_list, rad_list):