电讯服务 A B C
1 1 1 0
2 1 0 0
3 1 0 0
4 1 0 1
5 1 1 0
6 1 1 0
7 1 0 0
8 1 1 0
9 0 0 0
10 1 0 0
11 1 0 0
12 1 1 1
13 1 1 0
14 1 1 0
15 0 1 0