1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20->1,2,3,4,5,6,8,9,10,11,12,13,15,16,17,18,19,20->2,3,4,5,6,7,8,10,11,12,13,15,16,18,19,20,->2,3,4,6,8,10,11,12,15,16,18,19,20->2,4,6,8,10,11,12,16,18,19,20,->2,4,8,10,11,12,16,18,20,->2,4,8,1011,16,18,20,->2,4,8,11,16,18,20,->2,4,11,16,18,20,->2,4,16,18,20,->2,4,16,20,->2,4,16,20,->2,16,20,->2,16,20,->2,20,->2,20->2,20 Вот так,как-то-2