| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] know for | 113 |
|
| 2 | [not/n't] know for | 69 |
|
| 3 | n't know for | 57 |
|
| 4 | not know for | 56 |
|
| 5 | [not/n't] known for | 43 |
|
