| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | essential for [adj] [noun sg] | 75 |
|
| 2 | essential for [adj] [noun pl] | 20 |
|
| 3 | essential for effective [noun] | 7 |
|
| 4 | essential for normal [noun] | 5 |
|
