| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [that] [adj] [noun pl] | 56 |
|
| 2 | is essential [that] [noun pl] | 27 |
|
| 3 | is essential [that] [adj] | 21 |
|
| 4 | essential [that] [adj] [noun pl] | 13 |
|
