[2,2,3,3,4,2,3,4,5,5,6,2,3,4,5,6,7,7,8,2,3,4,5,7, 8,9,3,4,7,9,10,2,3,5,6,9,10,11,11,12,2,3,4,5,6,7, 9,10,11,12,13,13,14,7,8,13,14,15,3,5,6,7,11,13,15, 16,2,3,4,5,7,8,9,13,15,16,17,17,18]