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