A:排除号码:
排除前区:03,06,14,20,22,27,33,35=0-1
排除后区:01,04,08,12
B:龙头凤尾:
龙头关注:02或04
凤尾关注:28或30
C:前区方案:
a-10码:02,04,07,09,13,15,26,28,30
b-14码:02,04,07,09,13,15,23,24,25,26,28,29,30
c-18码:01,02,04,07,08,09,13,15,18,21,23,24,25,26,28,29,30,31D:后区方案:
后区2码:03,05
后区4码:03,05,06,07
后区6码:02,03,05,06,07,10