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Resultados de listas de listas ([[a]])

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como represento o resultado desta função

type Matriz a = [[a]]
type Part = [string]

criaLinhas :: Matriz Part -> Matriz Part
craLinhas [] = []
criaLinhas l = ...

o que ponho aqui de maneira a o que sai das funções auxiliares sair da forma [[[string]]]?

Ps: desculpem a minha ignorancia.

Cumprimentos Gundares

Edited by Rui Carlos

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Tens que dizer o que queres produzir exactamente lol

Podes meter ai [ [ ["AA"],["AA"]],[["BB"],["BB"]] ] que funciona.

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