| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it has [been] [adv] shown [conj] | 6 |
|
| 2 | it has [been] [adv] show that | 6 |
|
| 3 | it has [been] [adv] show [that] | 6 |
|
| 4 | it has been [adv] show [conj] | 6 |
|
| 5 | it has [been] [adv] show that | 6 |
|
