Initial data commit

Task/Mutual-recursion/Fantom/mutual-recursion.fantom

@@ -0,0 +1,23 @@
+class Main
+{
+  static Int f (Int n)
+  {
+    if (n <= 0) // ensure n > 0
+      return 1
+    else
+      return n - m(f(n-1))
+  }
+
+  static Int m (Int n)
+  {
+    if (n <= 0) // ensure n > 0
+      return 0
+    else
+      return n - f(m(n-1))
+  }
+
+  public static Void main ()
+  {
+    50.times |Int n| { echo (f(n)) }
+  }
+}