How to get following result using foreach command?

Dear all,

For example, if data contains following numbers:

1 2 3 4 5 6

I would like get like below using foreach command,

1 2 
1 3
1 4 
1 5 
1 6

2 3
2 4 
2 5
2 6

3 4 
3 5
3 6

4 5
4 6

5 6

I would appreciate it a lot if anyone guides me how to get above result.

Ryan

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