| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [verb] [pron] [prep] [verb] [pos pn] | 10 |
|
| 2 | which prevent [pron] [prep] [verb] [pron] | 8 |
|
| 3 | [pron] prevent [pron] [prep] [verb] [pos pn] | 7 |
|
| 4 | which prevent [pron] [prep] [verb] [pos pn] | 6 |
|
