[重点]主攻274905头,主攻160534尾.
1,排除168头,495百,405十,278尾.
2,铁卒:23,28,73,78.
3,三字现:231,236,821,826,731,736,781,786.
4,二字定:23XX,28XX,73XX,78XX,2XX1,2XX6,7XX1,7XX6,X3X1,X3X6.
5,三字定:23X1,23X6,28X1,28X6,73X1,73X6,78X1,78X6,41X1,46X6.
6,直码:2311,2316,2361,2366,2811,2816,2861,2866,7311,7316.