| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to have been caused by a | 7 |
|
| 2 | [vb pp] to have been caused by a | 6 |
|
| 3 | to have been caused by a [noun] | 7 |
|
| 4 | to have been caused by a [noun sg] | 7 |
|
