[重点]主攻274905头,主攻271685尾.
1,排除386头,053百,496十,尾390
2,铁卒:20.25,70,75.
3,三字现:201,206.251,256,701.706,751,756.269.
4,二定.2X0X,2X5X,7X0X.7X5X,2XX2,2XX7,7XX2,7XX7.
5,三定,2X02.2X52,2X07,2X57,7X02,7X07,7X52,7X57,X602,X607.
6,直码:2602.2607,2652,2657,7602.7607,7652,7657.2152,2157.