排除前区:03,04,05,13,14,23,26,35=0-1
排除后区:02,03,06,07
B:龙头凤尾:
龙头关注:09或11
凤尾关注:31或32
C:前区方案:
a-10码:09,11,15,17,22,24,25,28,31,32
b-14码:01,02,06,09,11,15,17,19,22,24,25,28,31,32
c-18码:01,02,06,09,11,15,17,19,21,22,24,25,27,28,30,31,32,34
D:后区方案:
后区2码:05,08
后区4码:05,08,10,11
后区6码:01,04,05,08,10,11