| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] essential [conj] [pers pn] [verb] | 73 |
|
| 2 | [is] [conj] [pers pn] [verb] [pos pn] | 66 |
|
| 3 | essential [conj] [pers pn] [verb] [pos pn] | 10 |
|
