[4,6,6,7,7,7,8,9,10,10,10,10,11,12,12,12,12,12,13, 13,13,13,13,13,14,14,15,15,16,16,16,16,16,16,16, 17,17,18,18,18,18,18,18,18,18,19,19,19,19,19,19, 19,19,19,20,20,20,21,21,21]