| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [not/n't] [adv] establish | 22 |
|
| 2 | [is] not [adv] establish | 22 |
|
| 3 | [is] [not/n't] [adv] established | 18 |
|
| 4 | [is] [not/n't] clearly establish | 5 |
|
