[重点]主攻271638头,主攻270538尾.
1,排除059头,274百,165十,169尾.
2,铁卒:43,48,93,89.
3,三字现:431,436,481,486,931,936,981,986.
4,二定:3XX2,3XX7,8XX2,8XX7,XX43,XX48,XX93,XX98,XX90,XX40
5,三定:3X42,3X47.3x92,3X97,8X42,8X47,8X92,8X97,0X40,0X45.
6,直码:3142,3147,3192,3197,8142,8147,8192,8197,3640,3690.