| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] know it at the time | 12 |
|
| 2 | [not/n't] know it at the time | 12 |
|
| 3 | n't know it at the time | 6 |
|
| 4 | not know it at the time | 6 |
|
