0,4,8,12,16
1,5,9,13,16
2,6,10,14,16
3,7,11,15,16
0,1,2,3,17
4,5,6,7,17
8,9,10,11,17
12,13,14,15,17
0,5,10,15,18
4,9,14,3,18
8,13,2,7,18
12,1,6,11,18
0,9,2,11,19
4,13,6,15,19
8,1,10,3,19
12,5,14,7,19
0,13,10,7,20
4,1,14,11,20
8,5,2,15,20
12,9,6,3,20
16,17,18,19,20
