[重点]主攻273816头,主攻163805尾.
1,排除045头,052百,051十,497尾.
2,铁卒:31,36,81,86.
3,三字现:310,315,360,365,810,815,860,865.
4,二定:XX21,XX26,XX71,XX76,3XX1,3XX6,8XX1,8XX6,33XX,38XX
5,三定:3X21,3X26.3x71,3X76,8X21,8X26,8X71,8X76,33X6,38X6.
6,直码:3321,3326,3371,3376,3821,3826,3871,3876,8321,8326.