OA |
a |
OB |
b |
a |
b |
MN |
OC |
MN |
AB |
OB |
OA |
OC |
1 |
2 |
OB |
OA |
MN |
OC |
OB |
OA |
1 |
2 |
OB |
OA |
OB |
OA |
. |
| . |
1 |
2 |
PA |
PB |
m |
3 |
n |
A |
2 |
π |
2 |
n |
AB |
3 |
m |
n |
a |
b |
a |
b |
a |
b |
π |
3 |
OA |
a |
b |
OB |
a |
b |
A.
| B.
| C.
| D.
|
a |
a |
b |
a |
c |
b |
c |
a |
b |
a |
c |
b |
c |
a |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
a |
a |
OP1 |
OP2 |
OP1 |
OP2 |
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