n26
22,23,24,25;
15,18,21,22;
14,17,20,22;
19,20,21,25;
15,17,19,24;
14,18,19,23;
16,17,18,25;
15,16,20,23;
14,16,21,24;
13,14,15,25;
13,18,20,24;
13,17,21,23;
13,16,19,22;
9,10,11,12;
2,5,8,9;
1,4,7,9;
6,7,8,12;
2,4,6,11;
1,5,6,10;
3,4,5,12;
2,3,7,10;
1,3,8,11;
0,1,2,12;
0,5,7,11;
0,4,8,10;
0,3,6,9.