[0,2,3,4,4,5,5,6,6,6,7,7,7,8,8,8,8,9,9,9,9,10,10, 10,10,10,11,11,11,11,11,12,12,12,12,12,12,13,13, 13,13,13,13,14,14,14,14,14,14,14,15,15,15,15,15, 15,15,16,16,16,16,16,16,16,16,17,17,17,17,17,17, 17,17,18,18,18]