[重点]主攻273849头,主攻273849尾.
1,排除160头,386百,056十,尾380
2,铁卒:24.29,74,79.
3,三字现:234,239,284,289,734,739,784,789.
4,二定:X4X2,X4X7.X9X2,X9X7,X24X,X29X,X74X,X79X,XX99.
5,三定:X244,X249,X294,X299,X744,X749,X794,X799,32X4,32X9.
7,直码:3244,3249,3294,3299,3744.3749,3794,3799,8244,8249.