| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | ensure that it [is] [not/n't] | 11 |
|
| 2 | ensure [that] it [is] [not/n't] | 11 |
|
| 3 | ensure [that] it [is] not | 11 |
|
| 4 | ensure [that] it is [not/n't] | 10 |
|
| 5 | to ensure [that] it [is] [not/n't] | 7 |
|
