| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it is [not/n't] | 1515 |
|
| 2 | [coord] it is essential | 52 |
|
| 3 | it is [not/n't] essential | 29 |
|
| 4 | [coord] is [not/n't] essential | 7 |
|
