| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | help prevent [det] | 15 |
|
| 2 | help to prevent [adj] | 14 |
|
| 3 | help prevent [adj] | 13 |
|
| 4 | help prevent [adj] | 12 |
|
| 5 | help prevent this | 5 |
|
| 6 | help prevent this | 5 |
|
