| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [adv] known that | 17 |
|
| 2 | it is [adv] [adv] known that | 10 |
|
| 3 | it is [adv] well known that | 9 |
|
| 4 | it is not [adv] known that | 7 |
|
| 5 | it is not [adv] known that | 7 |
|
| 6 | it is [not/n't] [adv] known that | 7 |
|
