| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | ensure that none [prep] | 9 |
|
| 2 | ensure that none of | 9 |
|
| 3 | ensure that none [prep] | 9 |
|
| 4 | ensure that none [prep] | 9 |
|
| 5 | ensure that none of | 9 |
|
| 6 | to ensure that none [prep] | 5 |
|
