| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | so [conj] [verb] [conj] | 81 |
|
| 2 | so [conj] [to-vb] [conj] | 54 |
|
| 3 | [adv] [conj] to ensure [conj] | 30 |
|
| 4 | [adv] [conj] to ensure [conj] | 29 |
|
| 5 | so [conj] ensure [conj] | 21 |
|
| 6 | so [conj] to ensure [conj] | 21 |
|
