排除前区:01,03,04,05,07,19,20,34=0-1
排除后区:01,03,04,10
B:龙头凤尾:
龙头关注:08或10
凤尾关注:28或31
C:前区方案:
a-10码:08,10,16,17,21,24,25,27,28,31
b-14码:08,09,10,12,13,16,17,21,24,25,27,28,31,35
c-18码:08,09,10,12,13,15,16,17,18,21,22,24,25,26,27,28,31,35
D:后区方案:
后区2码:07,08
后区4码:05,06,07,08
后区6码:02,05,06,07,08,11