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