| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] [vb pp] to prevent [adj] | 6 |
|
| 2 | [be] [adv] [vb pp] to prevent [adj] | 6 |
|
| 3 | [adv] [vb pp] to prevent [art] [adj] | 5 |
|
| 4 | [adv] [vb pp] to prevent [art] [adj] | 5 |
|
