| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] a vital role [prep] | 24 |
|
| 2 | [vb -s] a vital role [prep] | 24 |
|
| 3 | [vb -s] a vital role in | 23 |
|
| 4 | plays a vital role [prep] | 22 |
|
