不计顺序有252种吧
0, 1, 2, 3, 4
0, 1, 2, 3, 5
0, 1, 2, 3, 6
0, 1, 2, 3, 7
0, 1, 2, 3, 8
0, 1, 2, 3, 9
0, 1, 2, 4, 5
0, 1, 2, 4, 6
0, 1, 2, 4, 7
0, 1, 2, 4, 8
0, 1, 2, 4, 9
0, 1, 2, 5, 6
0, 1, 2, 5, 7
0, 1, 2, 5, 8
0, 1, 2, 5, 9
0, 1, 2, 6, 7
0, 1, 2, 6, 8
0, 1, 2, 6, 9
0, 1, 2, 7, 8
0, 1, 2, 7, 9
0, 1, 2, 8, 9
0, 1, 3, 4, 5
0, 1, 3, 4, 6
0, 1, 3, 4, 7
0, 1, 3, 4, 8
0, 1, 3, 4, 9
0, 1, 3, 5, 6
0, 1, 3, 5, 7
0, 1, 3, 5, 8
0, 1, 3, 5, 9
0, 1, 3, 6, 7
0, 1, 3, 6, 8
0, 1, 3, 6, 9
0, 1, 3, 7, 8
0, 1, 3, 7, 9
0, 1, 3, 8, 9
0, 1, 4, 5, 6
0, 1, 4, 5, 7
0, 1, 4, 5, 8
0, 1, 4, 5, 9
0, 1, 4, 6, 7
0, 1, 4, 6, 8
0, 1, 4, 6, 9
0, 1, 4, 7, 8
0, 1, 4, 7, 9
0, 1, 4, 8, 9
0, 1, 5, 6, 7
0, 1, 5, 6, 8
0, 1, 5, 6, 9
0, 1, 5, 7, 8
0, 1, 5, 7, 9
0, 1, 5, 8, 9
0, 1, 6, 7, 8
0, 1, 6, 7, 9
0, 1, 6, 8, 9
0, 1, 7, 8, 9
0, 2, 3, 4, 5
0, 2, 3, 4, 6
0, 2, 3, 4, 7
0, 2, 3, 4, 8
0, 2, 3, 4, 9
0, 2, 3, 5, 6
0, 2, 3, 5, 7
0, 2, 3, 5, 8
0, 2, 3, 5, 9
0, 2, 3, 6, 7
0, 2, 3, 6, 8
0, 2, 3, 6, 9
0, 2, 3, 7, 8
0, 2, 3, 7, 9
0, 2, 3, 8, 9
0, 2, 4, 5, 6
0, 2, 4, 5, 7
0, 2, 4, 5, 8
0, 2, 4, 5, 9
0, 2, 4, 6, 7
0, 2, 4, 6, 8
0, 2, 4, 6, 9
0, 2, 4, 7, 8
0, 2, 4, 7, 9
0, 2, 4, 8, 9
0, 2, 5, 6, 7
0, 2, 5, 6, 8
0, 2, 5, 6, 9
0, 2, 5, 7, 8
0, 2, 5, 7, 9
0, 2, 5, 8, 9
0, 2, 6, 7, 8
0, 2, 6, 7, 9
0, 2, 6, 8, 9
0, 2, 7, 8, 9
0, 3, 4, 5, 6
0, 3, 4, 5, 7
0, 3, 4, 5, 8
0, 3, 4, 5, 9
0, 3, 4, 6, 7
0, 3, 4, 6, 8
0, 3, 4, 6, 9
0, 3, 4, 7, 8
0, 3, 4, 7, 9
0, 3, 4, 8, 9
0, 3, 5, 6, 7
0, 3, 5, 6, 8
0, 3, 5, 6, 9
0, 3, 5, 7, 8
0, 3, 5, 7, 9
0, 3, 5, 8, 9
0, 3, 6, 7, 8
0, 3, 6, 7, 9
0, 3, 6, 8, 9
0, 3, 7, 8, 9
0, 4, 5, 6, 7
0, 4, 5, 6, 8
0, 4, 5, 6, 9
0, 4, 5, 7, 8
0, 4, 5, 7, 9
0, 4, 5, 8, 9
0, 4, 6, 7, 8
0, 4, 6, 7, 9
0, 4, 6, 8, 9
0, 4, 7, 8, 9
0, 5, 6, 7, 8
0, 5, 6, 7, 9
0, 5, 6, 8, 9
0, 5, 7, 8, 9
0, 6, 7, 8, 9
1, 2, 3, 4, 5
1, 2, 3, 4, 6
1, 2, 3, 4, 7
1, 2, 3, 4, 8
1, 2, 3, 4, 9
1, 2, 3, 5, 6
1, 2, 3, 5, 7
1, 2, 3, 5, 8
1, 2, 3, 5, 9
1, 2, 3, 6, 7
1, 2, 3, 6, 8
1, 2, 3, 6, 9
1, 2, 3, 7, 8
1, 2, 3, 7, 9
1, 2, 3, 8, 9
1, 2, 4, 5, 6
1, 2, 4, 5, 7
1, 2, 4, 5, 8
1, 2, 4, 5, 9
1, 2, 4, 6, 7
1, 2, 4, 6, 8
1, 2, 4, 6, 9
1, 2, 4, 7, 8
1, 2, 4, 7, 9
1, 2, 4, 8, 9
1, 2, 5, 6, 7
1, 2, 5, 6, 8
1, 2, 5, 6, 9
1, 2, 5, 7, 8
1, 2, 5, 7, 9
1, 2, 5, 8, 9
1, 2, 6, 7, 8
1, 2, 6, 7, 9
1, 2, 6, 8, 9
1, 2, 7, 8, 9
1, 3, 4, 5, 6
1, 3, 4, 5, 7
1, 3, 4, 5, 8
1, 3, 4, 5, 9
1, 3, 4, 6, 7
1, 3, 4, 6, 8
1, 3, 4, 6, 9
1, 3, 4, 7, 8
1, 3, 4, 7, 9
1, 3, 4, 8, 9
1, 3, 5, 6, 7
1, 3, 5, 6, 8
1, 3, 5, 6, 9
1, 3, 5, 7, 8
1, 3, 5, 7, 9
1, 3, 5, 8, 9
1, 3, 6, 7, 8
1, 3, 6, 7, 9
1, 3, 6, 8, 9
1, 3, 7, 8, 9
1, 4, 5, 6, 7
1, 4, 5, 6, 8
1, 4, 5, 6, 9
1, 4, 5, 7, 8
1, 4, 5, 7, 9
1, 4, 5, 8, 9
1, 4, 6, 7, 8
1, 4, 6, 7, 9
1, 4, 6, 8, 9
1, 4, 7, 8, 9
1, 5, 6, 7, 8
1, 5, 6, 7, 9
1, 5, 6, 8, 9
1, 5, 7, 8, 9
1, 6, 7, 8, 9
2, 3, 4, 5, 6
2, 3, 4, 5, 7
2, 3, 4, 5, 8
2, 3, 4, 5, 9
2, 3, 4, 6, 7
2, 3, 4, 6, 8
2, 3, 4, 6, 9
2, 3, 4, 7, 8
2, 3, 4, 7, 9
2, 3, 4, 8, 9
2, 3, 5, 6, 7
2, 3, 5, 6, 8
2, 3, 5, 6, 9
2, 3, 5, 7, 8
2, 3, 5, 7, 9
2, 3, 5, 8, 9
2, 3, 6, 7, 8
2, 3, 6, 7, 9
2, 3, 6, 8, 9
2, 3, 7, 8, 9
2, 4, 5, 6, 7
2, 4, 5, 6, 8
2, 4, 5, 6, 9
2, 4, 5, 7, 8
2, 4, 5, 7, 9
2, 4, 5, 8, 9
2, 4, 6, 7, 8
2, 4, 6, 7, 9
2, 4, 6, 8, 9
2, 4, 7, 8, 9
2, 5, 6, 7, 8
2, 5, 6, 7, 9
2, 5, 6, 8, 9
2, 5, 7, 8, 9
2, 6, 7, 8, 9
3, 4, 5, 6, 7
3, 4, 5, 6, 8
3, 4, 5, 6, 9
3, 4, 5, 7, 8
3, 4, 5, 7, 9
3, 4, 5, 8, 9
3, 4, 6, 7, 8
3, 4, 6, 7, 9
3, 4, 6, 8, 9
3, 4, 7, 8, 9
3, 5, 6, 7, 8
3, 5, 6, 7, 9
3, 5, 6, 8, 9
3, 5, 7, 8, 9
3, 6, 7, 8, 9
4, 5, 6, 7, 8
4, 5, 6, 7, 9
4, 5, 6, 8, 9
4, 5, 7, 8, 9
4, 6, 7, 8, 9
5, 6, 7, 8, 9
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