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diff --git a/IterableClass.icl b/IterableClass.icl
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+implementation module IterableClass
+
+import StdEnv
+
+stepn :: Int a -> a | step a
+stepn 0 a = a
+stepn n a = stepn (n-1) (step a)
+
+rewindn :: Int a -> a | rewind a
+rewindn 0 a = a
+rewindn n a = rewindn (n-1) (rewind a)
+
+stepOrRewindn :: Int a -> a | step, rewind a
+stepOrRewindn 0 a = a
+stepOrRewindn n a
+| n < 0 = rewindn (0-n) a
+| n > 0 = stepn n a
+