A:排除号码:
排除前区:01,05,09,14,17,19,27,29=0-1
排除后区:02,05,07,12
B:龙头凤尾:
龙头关注:03或06
凤尾关注:30或31
C:前区方案:
a-10码:03,06,08,13,15,21,23,24,30,31
b-14码:03,06,08,10,13,15,18,20,21,22,23,24,30,31
c-18码:02,03,04,06,08,10,11,13,15,16,18,20,21,22,23,24,30,31
D:后区方案:
后区2码:06,08
后区4码:06,08,09,10
后区6码:01,06,08,09,10,11