排除前区:03,05,08,14,16,22,26,27=0-1
排除后区:01,02,05,07
B:龙头凤尾:
龙头关注:01或06
凤尾关注:32或33
C:前区方案:
a-10码:01,06,07,09,17,19,24,28,32,33
b-14码:01,06,07,09,15,17,18,19,20,21,24,28,32,33
c-18码:01,02,04,06,07,09,10,12,15,17,18,19,20,21,24,28,32,33
D:后区方案:
后区2码:06,08
后区4码:06,08,09,12
后区6码:03,04,06,08,09,12