| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of [noun] [pron] is | 1945 |
|
| 2 | [noun] [pron] is essential | 118 |
|
| 3 | of [noun] is essential | 58 |
|
| 4 | of [pron] is essential | 5 |
|
