排除前区:03,09,11,19,25,26,33,35=0-1
排除后区:02,04,05,08
B:龙头凤尾:
龙头关注:02或10
凤尾关注:32或34
C:前区方案:
a-10码:02,10,17,18,23,24,27,28,32,34
b-14码:01,02,04,06,08,10,17,18,23,24,27,28,32,34
c-18码:01,02,04,06,07,08,10,14,15,16,17,18,23,24,27,28,32,34
D:后区方案:
后区2码:10,11
后区4码:03,06,10,11
后区6码:03,06,09,10,11,12