n40
1,2,3,4,5,6,7;
0,6,7,8,9,10,11;
0,3,6,12,13,14,15;
0,2,7,12,16,17,18;
0,8,13,16,19,20,21;
0,9,14,17,19,22,23;
0,1,2,10,15,20,22;
0,1,3,11,18,21,23;
1,4,10,11,24,25,26;
1,5,22,23,24,27,28;
1,6,8,15,21,25,27;
1,7,8,18,20,26,28;
2,3,13,18,20,29,30;
2,4,12,15,25,29,31;
2,5,17,22,30,31,32;
2,6,10,13,16,25,32;
3,4,15,20,21,26,33;
3,5,14,23,30,33,34;
3,7,11,12,26,29,34;
4,5,24,31,33,35,36;
4,6,11,12,16,21,35;
4,7,10,16,20,29,36;
5,6,9,14,27,32,35;
5,7,9,17,28,34,36;
8,9,19,27,28,37,38;
8,10,13,15,26,29,37;
8,11,16,18,25,29,38;
9,10,22,24,32,36,37;
9,11,23,24,34,35,38;
12,13,18,21,25,26,39;
12,14,17,31,34,35,39;
13,14,19,30,32,37,39;
14,15,22,27,31,33,37;
16,17,19,32,35,36,38;
17,18,23,28,30,38,39;
19,20,22,28,30,33,36;
19,21,23,27,33,35,39;
24,25,27,31,32,38,39;
24,26,28,33,34,37,39;
29,30,31,34,36,37,38.