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using accumulator rev l = rev' l [] rev'::[a]->[a]->[a] rev' [] l = l rev' (x:xs) l = rev' xs (x:l)
rev l = rev' l [] rev'::[a]->[a]->[a] rev' [] l = l rev' (x:xs) l = rev' xs (x:l)
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using accumulator
rev l = rev' l []rev'::[a]->[a]->[a]
rev' [] l = l
rev' (x:xs) l = rev' xs (x:l)