[R] pairs of numbers

[emj83]

Hi,

I have two lists of numbers which are both 1,2,3,4.
I would like to combine pairs so that I have:
1,2
1,3
1,4
2,3
2,4
3,4.

I know that expand.grid() can give me all combinations of pairs. 

Any suggestions would be much appreciated.

Emma
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