| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] so as to ensure | 7 |
|
| 2 | [vb pp] so [conj] to ensure | 7 |
|
| 3 | [verb] so [conj] to ensure | 7 |
|
| 4 | [verb] so as to ensure | 7 |
|
| 5 | [verb] so [subord] to ensure | 7 |
|
