| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | so [conj] [conj] | 786 |
|
| 2 | [conj] to ensure [conj] | 220 |
|
| 3 | so [conj] to ensure | 39 |
|
| 4 | so to ensure [conj] | 5 |
|
