| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] an important role [prep] | 56 |
|
| 2 | [vb -s] an important role in | 49 |
|
| 3 | plays an important role [prep] | 42 |
|
| 4 | has an important role [prep] | 11 |
|
