| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | so [conj] [conj] [art] | 178 |
|
| 2 | [conj] to ensure [conj] [art] | 69 |
|
| 3 | so [conj] to ensure [conj] | 21 |
|
| 4 | so [conj] to ensure [art] | 9 |
|
