a |
3 |
b |
1 |
2 |
| ||
2 |
x |
a |
b |
y |
a |
b |
x |
y |
a |
3 |
b |
1 |
2 |
| ||
2 |
a |
b |
a |
b |
x |
y |
x |
y |
a |
b |
a |
b |
a2 |
a |
b |
a |
b |
b2 |
1 |
4 |
1 |
4 |
3 |
4 |
3 |
4 |
3 |
4 |
3 |
4 |
a |
a |
b |
b |
a |
a |
a |
a |
b |
c |
a |
b |
c |
a |
b |
a |
b |
x2 |
a2 |
y2 |
b2 |
1 |
2 |
FP |
FQ |
x2 |
a2 |
y2 |
b2 |
3 |
2 |
1 |
2 |
OA |
OB |
a |
b |
a |
b |
a |
b |
a |
b |
i |
j |
k |
a |
b |
i |
j |
k |
i |
j |
k |
a |
b |
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