| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] known that | 147 |
|
| 2 | it is [adv] that [art] | 121 |
|
| 3 | is [adv] known that [art] | 41 |
|
| 4 | it is known that [art] | 37 |
|
