| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but it is [adv] known | 27 |
|
| 2 | but it is not known | 14 |
|
| 3 | but it is not known | 14 |
|
| 4 | but it is [not/n't] known | 14 |
|
| 5 | but it is [adv] known | 13 |
|
| 6 | but it is known that | 11 |
|
| 7 | but it is known [that] | 11 |
|
| 8 | but it is known [conj] | 11 |
|
| 9 | but it is known that | 11 |
|
