How to breakdown n data into all possible k groups

Hello all,
what I want to do is to break down n data (e.g. 4 for illustration purposes) into all possible 2 groups.
For 1 2 3 4 for example all possible 2 groups are
1 & 2 3 4
2 & 1 3 4
3 & 1 2 4
4 & 1 2 3
1 2 & 3 4
1 3 & 2 4
1 4 & 2 3
I hope you can understand what I mean. Of course order is not an issue in this case.
Regards,

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