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