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diff --git a/2019/sketch_190518a/sketch_190518a.pyde b/2019/sketch_190518a/sketch_190518a.pyde
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+"""*
+ *        A simple example for class Combination.
+ *        fjenett 20090306
+ """
+
+add_library('Combinatorics')
+
+def setup():
+    size(500, 500)
+    background(0)
+    fill(255, 0, 0)
+    textSize(11)
+
+    chars = "0123456789ABCDEF"
+    # Generate the following combinations:
+    # place 16 elements on 3 positions
+    combinations = Combination(len(chars), 3)
+    println(combinations.totalAsInt())
+    
+    h = height / (combinations.totalAsInt() + 0.5) * 10.8
+    x, y, w = 0, h, 48
+    while (combinations.hasMore()):
+        c = combinations.next()
+        t = chars[c[0]] + " " + chars[c[1]] + " " + chars[c[2]]
+        text(t, 20 + x, 5 + y)
+        x += w
+        if x > width:
+            x = 0
+            y += h
+            
+    saveFrame("sketch_190518a.png")
+    noLoop()