| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | enough to prevent | 41 |
|
| 2 | only to prevent | 12 |
|
| 3 | there to prevent | 10 |
|
| 4 | also to prevent | 9 |
|
| 5 | hard to prevent | 7 |
|
| 6 | together to prevent | 6 |
|
| 7 | regularly to prevent | 6 |
|
| 8 | now to prevent | 5 |
|
