n56
1,2,3,4,5,6,7;
0,4,5,8,9,10,11;
0,8,12,13,14,15,16;
0,9,12,17,18,19,20;
0,1,5,13,17,21,22;
0,1,4,14,18,23,24;
0,10,15,19,21,23,25;
0,11,16,20,22,24,25;
1,2,13,14,26,27,28;
1,3,17,18,26,29,30;
1,6,21,23,27,29,31;
1,7,22,24,28,30,31;
2,3,28,30,32,33,34;
2,4,8,14,32,35,36;
2,5,8,13,33,37,38;
2,6,27,34,35,37,39;
2,7,26,30,36,38,39;
3,4,9,18,32,40,41;
3,5,9,17,33,42,43;
3,6,29,34,40,42,44;
3,7,26,28,41,43,44;
4,6,10,23,35,40,45;
4,7,11,24,36,41,45;
5,6,10,21,37,42,46;
5,7,11,22,38,43,46;
6,7,31,39,44,45,46;
8,9,16,20,32,33,47;
8,10,15,35,37,47,48;
8,11,12,20,36,38,48;
9,10,19,40,42,47,49;
9,11,12,16,41,43,49;
10,11,25,45,46,48,49;
12,13,17,26,38,43,50;
12,14,18,26,36,41,51;
12,15,19,48,49,50,51;
13,15,21,27,37,50,52;
13,16,22,28,33,43,52;
14,15,23,27,35,51,53;
14,16,24,28,32,41,53;
15,16,25,47,49,52,53;
17,19,21,29,42,50,54;
17,20,22,30,33,38,54;
18,19,23,29,40,51,55;
18,20,24,30,32,36,55;
19,20,25,47,48,54,55;
21,22,25,31,46,52,54;
23,24,25,31,45,53,55;
26,27,29,39,44,50,51;
27,28,31,34,44,52,53;
29,30,31,34,39,54,55;
32,34,35,40,47,53,55;
33,34,37,42,47,52,54;
35,36,39,45,48,51,55;
37,38,39,46,48,50,54;
40,41,44,45,49,51,53;
42,43,44,46,49,50,52.