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data Tree a = Empty | Branch a (Tree a) (Tree a) deriving (Show, Eq)
layout :: Tree Char -> Tree (Char, (Int, Int))
layout t = fst $ draw t 1 1
where draw Empty x _ = (Empty, x)
draw (Branch v l r) x y =
(Branch (v, (x', y)) lt rt, x'')
where (lt, x') = draw l x (y + 1)
(rt, x'') = draw r (x' + 1) (y + 1)
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