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Dec 11th, 2018
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  1. data Tree a = Leaf a | Node (Tree a) (Tree a)
  2. maptree :: (a -> b) -> Tree a -> Tree b
  3. maptree f (Leaf n) = (Leaf (f(n)))
  4. maptree f (Node t1 t2) = (Node (maptree f t1) (maptree f t2))
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