| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] could be rule out | 6 |
|
| 2 | [noun pl] could be rule out | 6 |
|
| 3 | could [not/n't] be rule out | 7 |
|
| 4 | could [adv] be rule out | 7 |
|
| 5 | could not be rule out | 7 |
|
| 6 | could not be rule out | 7 |
|
