排除前区:01,02,03,11,12,15,28,31=0-1
排除后区:01,03,05,08
B:龙头凤尾:
龙头关注:07或13
凤尾关注:33或34
C:前区方案:
a-10码:07,13,19,20,22,27,30,32,33,34
b-14码:07,13,14,16,19,20,22,23,24,27,30,32,33,34
c-18码:06,07,13,14,16,19,20,21,22,23,24,26,27,30,32,33,34,35
D:后区方案:
后区2码:07,09
后区4码:02,04,07,09
后区6码:02,04,06,07,09,10