Question: Write a Haskell function called height that takes as input a tree and returns an integer that represents the height of the tree. Define the

Write a Haskell function called height that takes as input a tree and returns an integer that represents
the height of the tree. Define the height of a tree to be the number of edges in the longest path from
root to leaf. Assume the height of a Leaf is -1 and the height of a singleton is 0.

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