n40 1,2,3,4,5,6,7,8; 0,6,7,9,10,11,12,13; 0,5,7,14,15,16,17,18; 0,4,6,14,19,20,21,22; 0,3,5,9,19,23,24,25; 0,2,4,10,15,23,26,27; 0,1,3,11,16,20,26,28; 0,1,2,12,17,21,24,29; 0,13,18,22,25,27,28,29; 1,4,10,13,20,24,25,33; 1,5,9,11,17,30,31,33; 1,6,10,21,26,31,34,35; 1,7,13,16,29,30,34,37; 1,8,9,12,25,28,35,37; 2,3,16,17,23,30,38,39; 2,5,18,24,27,33,36,38; 2,6,12,14,18,26,28,39; 2,7,10,14,21,30,32,33; 2,8,15,16,28,29,32,36; 3,4,21,24,26,32,36,39; 3,6,9,22,28,31,36,38; 3,7,11,17,19,22,29,32; 3,8,20,21,25,29,30,31; 4,5,14,25,27,30,37,39; 4,7,9,15,19,33,36,37; 4,8,9,13,22,23,30,32; 5,6,11,16,19,34,36,39; 5,8,15,23,31,34,37,38; 6,8,13,16,18,20,35,38; 7,8,12,18,21,22,34,36; 10,12,14,17,22,23,25,31; 10,11,20,22,27,30,34,38; 17,18,19,21,25,33,35,39; 9,10,15,17,24,32,35,38; 11,12,26,27,29,31,36,37; 11,13,28,32,33,37,38,39; 15,18,19,20,24,26,29,34; 12,13,23,24,27,34,35,39; 14,15,20,27,28,31,33,35; 14,16,19,23,26,32,35,37.