a |
a |
b |
b |
A.[9,15] | B.[10,16] | C.[11,17] | D.[12,18] |
b |
a |
a |
b |
a |
a |
b |
b |
a |
a |
b |
a |
b |
b |
a |
b |
a |
b |
a |
b |
10 |
a |
a |
b |
a |
b |
a |
b |
a |
b |
b |
a |
a |
b |
AB |
AC |
5 |
4 |
a |
b |
a |
b |
a |
a |
a |
b |
b |
a |
a |
b |
a |
a |
a |
b |
a |
a |
b |
a |
b |
a |
b |
a |
a |
b |
3 |
a |
a |
b |
a |
b |
A.2 | B.4 | C.2
| D.4
|
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