a:排除号码:
排除前区:01,03,07,08,15,23,26,30=0-1
排除后区:01,02,03,09
b:龙头凤尾:
龙头关注:02或05
凤尾关注:31或33
c:前区方案:
a-10码:02,05,09,11,13,18,20,25,31,33
b-14码:02,05,09,11,13,17,18,19,20,21,24,25,31,33
c-18码:02,04,05,09,11,12,13,14,17,18,19,20,21,24,25,31,32,33
d:后区方案:
后区2码:06,08
后区4码:06,08,10,12
后区6码:04,06,08,10,11,12