How to find the permutations of y objects taken x at a time?
3 sper 4
0 1 2
0 1 3
0 2 1
0 2 3
0 3 1
0 3 2
1 0 2
1 0 3
1 2 0
1 2 3
1 3 0
1 3 2
2 0 1
2 0 3
2 1 0
2 1 3
2 3 0
2 3 1
3 0 1
3 0 2
3 1 0
3 1 2
3 2 0
3 2 1
2 sper 4
0 1
0 2
0 3
1 0
1 2
1 3
2 0
2 1
2 3
3 0
3 1
3 2
1 sper 4
0
1
2
3
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