| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] played a key role | 9 |
|
| 2 | who played a key role | 6 |
|
| 3 | who played a key role | 6 |
|
| 4 | he played a key role | 6 |
|
| 5 | [Wh pn] played a key role | 6 |
|
| 6 | he played a key role | 6 |
|
