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