排除前区:01,09,10,12,17,18,28,34=0-1
排除后区:09,10,11,12
B:龙头凤尾:
龙头关注:04或05
凤尾关注:31或32
C:前区方案:
a-10码:04,05,07,08,15,19,20,26,31,32
b-14码:02,03,04,05,07,08,11,15,19,20,21,26,31,32
c-18码:02,03,04,05,07,08,11,15,19,20,21,24,25,26,29,30,31,32
D:后区方案:
后区2码:03,05
后区4码:01,02,03,05
后区6码:01,02,03,04,05,08