| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | prevent [pron] [prep] [verb] | 138 |
|
| 2 | not prevent [pron] [prep] | 73 |
|
| 3 | not [pron] [prep] [verb] | 37 |
|
| 4 | not prevent [pron] [verb] | 23 |
|
