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Boas pessoal!! Queria que me ajudassem aqui neste problema.

Tenho este exemplo:

superStrings :: [string] -> [string] -> [(String, Int)]
superStrings ["mar", "ter"] ["termos", "maré", "ovo", "amar", "bater", "amarelo", "loja", "marujo"] resulta em [("mar", 4), ("ter", 2)]

ou seja a função vai contar quantas vezes aparece "mar" e "ter" na lista de Strings dada.

Já tenho isto feito, mas não estou a conseguir sair daqui:

superStrings :: [string] -> [string] -> [(String, Int)]
superStrings [] [] = []
superStrings _ [] = []
superStrings [] _ = []
superStrings (x:ys) (z:zs)
 |x == z = (x, aux x z)
 |otherwise = (ys, aux ys zs)

aux :: [string] -> [string] -> Int
aux [] [] = 0
aux _ [] = 0
aux [] _ = 0
aux (x:xs) (z:zs)
 |x == z = 1 + aux x zs
 |otherwise = 1 + aux xs zs

Agradecia se me pudessem ajudar.

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