yukan start with 0123456
1234560
2345601
3456012
4560123
5601234
6012345
......... thats 7
then tri 6543210
5432106
4321065 & so forth...14
then tri sumthun differ,
like: 0132456
0124356
0123546
0123465
repeet that with 02, 03, 04, 05, 06
then repeet with 12, 13, 14, 15, 16
& so forth