| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have played a key [noun] | 5 |
|
| 2 | who [verb] played a key role | 5 |
|
| 3 | who [verb] played a key role | 5 |
|
| 4 | who [verb] played a key [noun sg] | 5 |
|
| 5 | who [verb] played a key [noun] | 5 |
|
