a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
| ||||
|
|
-3+4 | ||
|
| ||
13 |
a |
b |
a |
b |
a |
b |
a |
b |
1 |
3 |
a |
b |
10 |
3 |
4 |
3 |
1 |
3 |
a |
b |
1 |
3 |
a |
b |
1 |
3 |
OA |
a |
OB |
b |
OC |
c |
OD |
d |
OE |
e |
a |
c |
b |
d |
e |
a |
b |
a |
b |
c |
a |
b |
c |
a |
b |
c |
A.
| B.
| ||||||||||
C.
| D.
|
a |
e1 |
e2 |
b |
e1 |
e2 |
c |
e1 |
3e2 |
a |
b |
n |
c |
AB |
e1 |
e2 |
BC |
e1 |
e2 |
CD |
e1 |
e2 |
AB |
e1 |
e2 |
BC |
2e1 |
3e2 |
CD |
e1 |
e2 |
AP |
PB |
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