| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [subord] to ensure | 42 |
|
| 2 | [adv] as to ensure | 41 |
|
| 3 | so [subord] to ensure | 39 |
|
| 4 | so [subord] to ensure | 39 |
|
