Combinations

I need some help here.

From a vector of variable length (say, c(A,B,C,D), I need to obtain all

posible combinations (order doesn't matter) of the elements.
I would like a function such as:
function(x,c(A,B,C,D))
to give a matrix (for x=3) like:
A B C
A B D
A C D
B C D

or for x=2
A B
A C
A D
B C
B D
C D

And so on.
Any ideas??

Thank you,
Alex Ahgarin
Data Management
I.R.W. Co.

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