A:排除号码:
排除前区:01,03,07,08,09,12,14,32=0-1
排除后区:01,03,04,07
B:龙头凤尾:
龙头关注:02或10
凤尾关注:29或31
C:前区方案:
a-10码:02,10,15,18,19,21,26,28,29,31
b-14码:02,10,11,15,16,17,18,19,21,23,26,28,29,31
c-18码:02,04,05,10,11,15,16,17,18,19,21,23,25,26,27,28,29,31
D:后区方案:
后区2码:09,11
后区4码:05,08,09,11
后区6码:02,05,08,09,10,11