a |
b |
c |
a |
b |
a |
b |
c |
c |
a |
b |
a |
b |
|a| |
|b| |
1 |
2 |
a |
b |
|
3 |
c |
a |
b |
c |
a |
b |
|c| |
3 |
a |
b |
c |
a |
b |
c |
3 |
3 |
a |
b |
c |
a |
b |
c |
3 |
a |
b |
c |
c |
a |
b |
c |
|c| |
a |
b |
c |
a |
b |
c |
3 |
a |
b |
c |
c |
3 |
3 |
a |
b |
3 |
a |
b |
2 |
OQ |
OA |
ON |
| ||
2 |
i |
j |
AB |
i |
j |
AC |
i |
j |
3 |
AB |
AC |
A.3+
| B.
| C.3 | D.
|
π |
4 |
GA |
GB |
GC |
0 |
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