[重点]主攻273805头,主攻162749尾.
1,排除169头,138百,495十,508尾.
2,铁卒:21,26,71,76.
3,三字现:210,215,260,265,710,715,760,765.
4,二定:X2X2,X7X2.X2X7,X7X7,2XX2,2XX7,7XX7,7XX2,20XX.
5,三定:20X1,20X6,25X1,25X6,70X1,70X6,75X1,75X6,52X2,07X2.
6,直码:2531,2536,2581,2586,7031,7036,7081,7086,5212,5217.