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