[2,1,2,1,3,1,2,3,1,2,4,1,3,4,1,5,1,2,5,1,2,3,5,1,3,4,5,1,2,3,4,5,1,3,6,1,4,6,1,2,4,6,1,2,3,4,6,1,3,5,6,1,2,4,5,6,1,3,4,5,6,1,2,7,1,2,3,7,1,4,7,1,2,3,4,7,1,2,5,7,1,4,5,7,1,6,7]
