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Merging two lists in Haskell

Can't figure out how to merge two lists in the following way in Haskell:

INPUT:  [1,2,3,4,5] [11,12,13,14]

OUTPUT: [1,11,2,12,3,13,4,14,5]
Solution 
  • merge :: [a] -> [a] -> [a]
merge xs     []     = xs
merge []     ys     = ys
merge (x:xs) (y:ys) = x : y : merge xs ys