a |
b |
c |
a |
b |
c |
c |
a |
b |
0 |
a |
b |
a |
b |
b |
c |
a |
c |
a |
b |
c |
a |
b |
a |
b |
a |
b |
a |
b |
c |
c |
c |
a |
b |
b |
a |
b |
a |
b |
b |
c |
a |
c |
a |
b |
c |
b |
c |
a•
|
c |
a |
b |
c |
b |
c |
a |
c |
a |
b |
c |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.3 | B.2 | C.-2 | D.-3 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
A.
| B.-
| C.
| D.-
|
a |
b |
a |
b |
a |
BA |
CA |
DA |
a |
BC |
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