| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | so [subord] to ensure [art] [noun] | 5 |
|
| 2 | so as to ensure [art] [noun] | 5 |
|
| 3 | so [conj] to ensure [art] [noun sg] | 5 |
|
| 4 | so as to ensure [art] [noun] | 5 |
|
| 5 | so [conj] to ensure [art] [noun] | 5 |
|
