[1,2,3,4,5,6,7,8,9,9,10,11,10,11,12,11,11,12,12, 13,12,13,14,15,13,13,14,14,14,15,14,15,15,16,16, 15,15,16,17,16,16,17,16,17,17,16,17,18,16,17,17, 17,17,18,17,18,18,18,19,20,17,18,19,18,17,18,19, 20]