[重点]主攻271605头,主攻270538尾.
1,排除439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:1XX2,1XX7,6XX2,6XX7,XX43,XX48,XX93,XX98,XX90,XX40
5,三定:1X42,1X47.1x92,1X97,6X42,6X47,6X92,6X97,X140,X190.
6,直码:1142,1147,1192,1197,6142,6147,6192,6197,3140,3190.