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+definition module GenTree
+
+import StdClass
+
+:: GenTree a b = Node a [GenTree a b] | Leaf b
+
+:: Either a b = This a | That b
+
+root :: (GenTree a b) -> Either a b
+trees :: (GenTree a b) -> [GenTree a b]
+
+isNodeMember :: a (GenTree a b) -> Bool | Eq a
+isLeafMember :: b (GenTree a b) -> Bool | Eq b
+allNodes :: (GenTree a b) -> [a]
+allLeaves :: (GenTree a b) -> [b]
+allMembers :: (GenTree a a) -> [a]
+
+map2 :: (a -> c,b -> d) (GenTree a b) -> GenTree c d