排除前区:03,07,08,16,18,20,22,32=0-1
排除后区:01,02,05,11
B:龙头凤尾:
龙头关注:02或05
凤尾关注:24或26
C:前区方案:
a-10码:02,05,10,12,17,19,21,23,24,26
b-14码:02,05,06,10,12,17,19,21,23,24,26,27,28,29
c-18码:01,02,05,06,10,12,13,14,15,17,19,21,23,24,26,27,28,29
D:后区方案:
后区2码:07,09
后区4码:03,04,07,09
后区6码:03,04,06,07,08,09