A:排除号码:
排除前区:03,07,10,13,16,17,26,33=0-1
排除后区:01,03,05,09
B:龙头凤尾:
龙头关注:02或06
凤尾关注:30或31
C:前区方案:
a-10码:02,06,11,14,15,25,27,28,30,31
b-14码:02,06,11,12,14,15,23,24,25,27,28,29,30,31
c-18码:01,02,05,06,11,12,14,15,19,20,23,24,25,27,28,29,30,31
D:后区方案:
后区2码:02,04
后区4码:02,04,07,08
后区6码:02,04,07,08,11,12