排除前区:03,05,09,15,22,27,29,35=0-1
排除后区:02,04,07,12
B:龙头凤尾:
龙头关注:02或07
凤尾关注:26或31
C:前区方案
a-10码:02,07,08,14,16,17,21,25,26,31
b-14码:01,02,04,06,07,08,12,14,16,17,21,25,26,31
c-18码:01,02,04,06,07,08,12,13,14,16,17,18,20,21,25,26,30,31
D:后区方案:
后区2码:06,08
后区4码:06,08,09,10
后区6码:03,05,06,08,09,10