| case |
|
|
|
|
| 1 | 1 |
|
|
|
| 2 |
|
|
|
|
| 3 |
|
| −1 |
|
| 4 |
|
| 1 |
|
| 5 |
|
|
|
|
| 6 | −1 |
|
|
|
| 7 | 1 |
|
|
|
| 8 | 1 |
|
|
|
| 9 |
|
| 1 |
|
| 10 |
|
| 1 |
|
| 11 |
|
|
|
|
| 12 |
|
|
|
|
| 13 |
|
|
|
|
| 14 |
|
|
|
|