Cartesian product of 2 lists in Haskell

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This is very easy with list comprehensions. To get the cartesian product of the lists xs and ys, we just need to take the tuple (x,y) for each element x in xs and each element y in ys.

This gives us the following list comprehension:

cartProd xs ys = [(x,y) | x <- xs, y <- ys]

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