n14 1,2,3; 0,4,5; 0,6,7; 0,8,9; 1,10,11; 1,12,13; 2,10,12; 2,11,13; 3,10,13; 3,11,12; 4,6,8; 4,7,9; 5,6,9; 5,7,8.