diff -r 000000000000 -r 4553c2885ce6 samples/sidemeanings/test/org/apidesign/sidemeanings/math/Factorial.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/sidemeanings/test/org/apidesign/sidemeanings/math/Factorial.java	Fri Mar 27 20:30:39 2009 +0100
@@ -0,0 +1,27 @@
+package org.apidesign.sidemeanings.math;
+
+/** 
+ */
+// BEGIN: design.sidemeanings.arith.factorial
+public final class Factorial extends Arithmetica {
+    public int factorial(int n) {
+        return sumRange(1, n);
+    }
+
+    @Override
+    protected int overridableSumTwo(int one, int second) {
+        return one * second;
+    }
+
+    @Override
+    protected int overridableSumAll(int... numbers) {
+        return defaultSumAll(numbers);
+    }
+
+    @Override
+    protected int overridableSumRange(int from, int to) {
+        return defaultSumRange(from, to);
+    }
+}
+// END: design.sidemeanings.arith.factorial
+