| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] known that [art] | 41 |
|
| 2 | it is [adv] known that the | 35 |
|
| 3 | it is [adv] known that the | 35 |
|
| 4 | it is well known that [art] | 31 |
|
| 5 | it is [adv] known that a | 5 |
|
| 6 | it is now known that [art] | 5 |
|
