| OA |
| a |
| OB |
| b |
| a |
| b |
| OP |
| OQ |
| a |
| b |
| OP |
| OQ |
| a |
| b |
| OP |
| OQ |
| OA1 |
| OA2 |
| OAn-1 |
| n-1 |
| 2 |
| a |
| b |
| OP |
| OA |
| AP |
| OA |
| 1 |
| 3 |
| OB |
| OA |
| OP |
| 2 |
| 3 |
| a |
| 1 |
| 3 |
| b |
| OQ |
| 1 |
| 3 |
| a |
| 2 |
| 3 |
| b |
| OP |
| OQ |
| a |
| b |
| ||||
| 2 |
| OA1 |
| OA2 |
| OA3 |
3(
| ||||
| 2 |
| OAk |
| OAn-k |
| OA |
| OB |
| OA1 |
| OA2 |
| OAn-1 |
| n-1 |
| 2 |
| a |
| b |
| 1 |
| 4 |
| a | 2 n |
| 1 |
| 2 |
| 1 |
| 4 |
| OAk |
| OAn-k |
| OA |
| OB |
| OAk |
| OA |
| AAk |
| OAn-k |
| OB |
| BAn-k |
| AAk |
| BAn-k |
| AAk |
| BAn-k |
| OAk |
| OAn-k |
| OA |
| OB |
| OA1 |
| OA2 |
| OA3 |
| OAn-2 |
| OAn-1 |
| OAn-1 |
| OAn-2 |
| OA2 |
| OA1 |
| OA1 |
| OAn-1 |
| OA2 |
| OAn-2 |
| OAn-1 |
| OA1 |
| OA |
| OB |
| OA1 |
| OA2 |
| OAn-1 |
| n-1 |
| 2 |
| a |
| b |
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