[Haskell-cafe] how can I select all the 3-element-combination out of a list efficiently

[geniusfat]

What I meant is this:
<http://en.wikipedia.org/wiki/Combinatorics#Combination_without_repetition> 
the order does not matter and each object can be chosen only once.
But thank all those who have offered help, it helps a lot ;)

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