A:排除号码:
排除前区:02,04,08,13,21,28,31,33=0-1
排除后区:02,03,06,11
B:龙头凤尾:
龙头关注:03或05
凤尾关注:23或27
C:前区方案:
a-10码:03,05,11,12,14,15,17,20,23,27
b-14码:03,05,11,12,14,15,16,17,18,19,20,23,24,27
c-18码:01,03,05,06,09,10,11,12,14,15,16,17,18,19,20,23,24,27
D:后区方案:
后区2码:05,07
后区4码:05,07,08,09
后区6码:01,05,07,08,09,12