-- | a tree containing integers
exTree1 :: Tree Int
exTree1 = Node (1 :: Int) [Node 2 [], Node 3 [], Node 4 [Node 5 [], Node 6 [Node 7 []]]]
exTree1 :: Tree Int
exTree1 = Node (1 :: Int) [Node 2 [], Node 3 [], Node 4 [Node 5 [], Node 6 [Node 7 []]]]
exTree1 = Node (1 :: Int) [Node 2 [], Node 3 [], Node 4 [Node 5 [], Node 6 [Node 7 []]]]