| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a central role in | 80 |
|
| 2 | [vb pp] a central role in | 14 |
|
| 3 | [vb pp] [verb] a role in | 11 |
|
| 4 | [vb pp] [verb] a central role | 6 |
|
