| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] it is essential for | 10 |
|
| 2 | [noun] it [is] essential for | 10 |
|
| 3 | [noun] it [is] essential for | 10 |
|
| 4 | [noun sg] it [is] essential for | 6 |
|
