char list list -> bool

Does an开发者_开发知识库yone know how to declare a function

rscheck : char list list -> bool

, that checks, if the number 1-9 are used once in every row and every list... so it returns true?

like in a sudoku game..

Thnx.

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It could be done like this (also there is a better way for sure, just some training for me):

http://pastebin.com/ViJM48LV