| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] long been recognised that | 14 |
|
| 2 | it [verb] long been recognised [conj] | 14 |
|
| 3 | it [verb] long been recognised that | 14 |
|
| 4 | it [verb] long been recognised [that] | 14 |
|
