A:排除号码:
排除前区:03,06,10,13,16,22,23,28=0-1
排除后区:04,05,09,12
B:龙头凤尾:
龙头关注:05或07
凤尾关注:27或29
C:前区方案:
a-10码:05,07,08,12,14,18,20,25,27,29
b-14码:05,07,08,12,14,18,19,20,24,25,26,27,29,31
c-18码:02,04,05,07,08,11,12,14,17,18,19,20,24,25,26,27,29,31D:后区方案:
后区2码:08,10
后区4码:03,06,08,10
后区6码:01,02,03,06,08,10