| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | so as to prevent [noun] | 9 |
|
| 2 | so as to prevent [noun] | 9 |
|
| 3 | so [subord] to prevent [noun] | 9 |
|
| 4 | so [conj] to prevent [noun sg] | 6 |
|
