| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [conj] [det] [noun pl] | 414 |
|
| 2 | [is] essential [conj] [det] | 68 |
|
| 3 | [is] essential [conj] [noun pl] | 39 |
|
| 4 | essential [conj] [det] [noun pl] | 28 |
|
