| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be not [adv] known that | 7 |
|
| 2 | it [is] not [adv] known that | 7 |
|
| 3 | it is not [adv] known that | 7 |
|
| 4 | it [be] not [adv] known that | 7 |
|
