| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] essential [that] | 53 |
|
| 2 | and it is [adv] [that] | 48 |
|
| 3 | and it is essential [that] | 21 |
|
| 4 | and it is [adv] essential | 11 |
|
