| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] established [conj] | 39 |
|
| 2 | it is [adv] established that | 36 |
|
| 3 | it is [adv] established [that] | 36 |
|
| 4 | it is [adv] established that | 36 |
|
| 5 | it is well established [conj] | 30 |
|
