251期后四杀三和尾:0,1,5250期后四杀三和尾:3,6,7中249期后四杀三和尾:0,1,2中248期后四杀三和尾:0,3,7中247期后四杀三和尾:2,5,6中246期后四杀三和尾:2,7,9中