排除后区:01,04,09,11
B:龙头凤尾:
龙头关注:02或04
凤尾关注:32或34
C:前区方案:
a-10码:02,04,11,13,18,20,23,25,32,34
b-14码:02,04,11,13,18,20,23,25,27,29,31,32,33,34
c-18码:02,04,06,11,12,13,18,20,22,23,25,26,27,29,31,32,33,34
D:后区方案:
后区2码:08,12
后区4码:03,05,08,12
后区6码:02,03,05,07,08,12