diff -r acf2c31e22d4 -r e1439046d96e samples/composition/src-api1.0/org/apidesign/math/Arithmetica.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/composition/src-api1.0/org/apidesign/math/Arithmetica.java	Sun Oct 06 22:05:14 2013 +0200
@@ -0,0 +1,38 @@
+package org.apidesign.math;
+
+/** Class to simplify arithmetical operations.
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ * @version 1.0
+ */
+// BEGIN: design.composition.arith1.0
+public class Arithmetica {
+    public int sumTwo(int one, int second) {
+        return one + second;
+    }
+    
+    public int sumAll(int... numbers) {
+        if (numbers.length == 0) {
+            return 0;
+        }
+        int sum = numbers[0];
+        for (int i = 1; i < numbers.length; i++) {
+            sum = sumTwo(sum, numbers[i]);
+        }
+        return sum;
+    }
+    
+    public int sumRange(int from, int to) {
+        int len = to - from;
+        if (len < 0) {
+            len = -len;
+            from = to;
+        }
+        int[] array = new int[len + 1];
+        for (int i = 0; i <= len; i++) {
+            array[i] = from + i;
+        }
+        return sumAll(array);
+    }
+}
+// END: design.composition.arith1.0