| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] known that [pron] | 19 |
|
| 2 | it is [adv] known that [pers pn] | 13 |
|
| 3 | it is well known that [pron] | 13 |
|
| 4 | it is [adv] known that it | 5 |
|
| 5 | it is [adv] known that it | 5 |
|
