| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] known that | 149 |
|
| 2 | it is [adv] that [det] | 33 |
|
| 3 | it is known that [det] | 17 |
|
| 4 | is [adv] known that [det] | 17 |
|
