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data Tree a = Empty | Branch a (Tree a) (Tree a) deriving (Show, Eq)
hbalTree :: a -> Int -> [Tree a]
hbalTree x 0 = [Empty]
hbalTree x 1 = [Branch x Empty Empty]
hbalTree x h =
[Branch x lt rt
| (h1, h2) <- [(h-2, h-1), (h-1, h-2), (h-1, h-1)]
, lt <- hbalTree x h1
, rt <- hbalTree x h2]
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