[Haskell-cafe] Combinations

[developer at imaginando.net]

Hi,

I need a functions which takes as argument a list of lists like this one:

[[1,2],[3],[4]]

and gives me a list of list with all the possible combinations like this one:

[[1,3,4],[2,3,4]]

In this case there are only 2 combinations but if there was more than one
element in the other lists the results were much more.

I'm a little stuck in this simple problem.

First i was thinking in cartesian product but then i realized that i may
not be what i really need.

Any tip?

Many thx,

Nuno Santos