n30
1,2,3,4,5;
0,6,7,8,9;
0,10,11,12,13;
0,14,15,16,17;
0,18,19,20,21;
0,22,23,24,25;
1,10,14,18,22;
1,11,15,19,23;
1,12,16,20,24;
1,13,17,21,25;
2,6,15,20,26;
2,7,14,21,27;
2,8,18,25,28;
2,9,19,24,29;
3,6,11,25,29;
3,7,10,24,28;
3,8,21,23,26;
3,9,20,22,27;
4,6,12,23,27;
4,7,13,22,26;
4,8,10,17,29;
4,9,11,16,28;
5,6,17,19,28;
5,7,16,18,29;
5,8,13,15,27;
5,9,12,14,26;
10,16,19,25,27;
11,17,18,24,26;
12,15,21,22,29;
13,14,20,23,28.