Correction: type RedBlackTree a = Tree a -- A red tree with two levels of black nodes is just a red node on -- top of two two-level black nodes. (Node a (Black2 a)) (Black2 a) a ()
type RedBlackTree a =
Tree a
-- A red tree with two levels of black nodes is just a red node on
-- top of two black nodes.
(Node (Black2 a) a) (Black2 a) a ()
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