| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] be central to | 16 |
|
| 2 | to [be] central to | 16 |
|
| 3 | [prep] be central to | 16 |
|
| 4 | [prep] [be] central to | 16 |
|
| 5 | [prep] [be] central to | 16 |
|
