排除前区:02,04,10,16,18,20,22,25=0-1
排除后区:03,05,07,09
B:龙头凤尾:
龙头关注:03或05
凤尾关注:32或34
C:前区方案:
a-10码:03,05,07,15,17,19,29,30,32,34
b-14码:03,05,07,13,15,17,19,23,26,27,29,30,32,34
c-18码:03,05,07,08,09,13,14,15,17,19,21,23,26,27,29,30,32,34
D:后区方案:
后区2码:11,12
后区4码:04,08,11,12
后区6码:01,02,04,08,11,12