n68
1,2,3,4,5,6,7,8;
0,9,10,11,12,13,14,15;
0,9,16,17,18,19,20,21;
0,10,16,22,23,24,25,26;
0,11,17,22,27,28,29,30;
0,12,18,23,27,31,32,33;
0,13,19,24,28,31,34,35;
0,14,20,25,29,32,34,36;
0,15,21,26,30,33,35,36;
1,2,37,38,39,40,41,42;
1,3,42,44,45,51,59,60;
1,4,38,43,52,56,60,62;
1,5,39,44,48,56,57,58;
1,6,40,49,51,55,58,62;
1,7,41,43,48,53,55,59;
1,8,37,45,49,52,53,57;
2,3,37,46,47,52,60,61;
2,4,38,46,50,51,55,59;
2,5,39,43,50,52,53,54;
2,6,40,43,44,56,59,61;
2,7,42,54,55,56,58,60;
2,8,41,44,47,51,53,58;
3,4,37,40,48,57,59,62;
3,5,38,41,48,49,51,52;
3,6,38,42,50,54,61,62;
3,7,39,41,45,47,54,57;
3,8,39,40,44,46,49,50;
4,5,37,41,43,44,45,46;
4,6,45,48,51,53,54,56;
4,7,44,50,53,57,60,61;
4,8,40,41,52,54,55,61;
5,6,37,38,53,58,59,60;
5,7,45,49,50,56,59,62;
5,8,46,51,54,57,60,62;
6,7,37,42,44,47,48,49;
6,8,43,45,47,50,55,60;
7,8,37,39,43,58,61,62;
9,15,16,22,27,31,34,36;
9,11,17,23,24,31,63,64;
9,12,18,25,26,36,63,65;
9,13,19,22,26,30,64,66;
9,14,21,23,25,27,30,67;
9,10,20,24,34,65,66,67;
11,14,18,19,27,35,36,64;
10,12,19,21,26,27,29,34;
10,15,25,27,28,32,35,65;
16,17,26,27,33,64,65,67;
16,21,25,34,35,63,64,66;
12,14,22,23,28,34,64,65;
13,15,23,26,32,34,63,67;
17,18,24,26,29,32,35,66;
10,13,17,21,23,28,33,66;
11,15,16,18,23,30,65,66;
14,15,18,21,28,29,31,63;
18,20,24,25,28,30,33,64;
13,14,17,20,30,35,63,65;
11,12,19,20,28,32,63,66;
12,15,22,25,29,33,66,67;
12,13,20,21,31,36,64,67;
10,14,17,19,22,31,32,67;
10,11,16,20,29,31,33,35;
16,19,24,29,30,36,63,67;
11,13,22,24,32,33,36,65;
38,39,47,49,53,55,56,61;
38,40,43,46,47,48,54,58;
39,42,45,46,48,52,55,62;
40,42,47,50,51,52,56,57;
41,42,46,49,57,58,59,61.