| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [vb pp] [art] | 20220 |
|
| 2 | [vb pp] to ensure [art] | 100 |
|
| 3 | [adv] [vb pp] to ensure | 76 |
|
| 4 | [adv] to ensure [art] | 44 |
|
