| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is essential for [adj] | 82 |
|
| 2 | [is] essential for [adj] | 55 |
|
| 3 | [is] essential for [det] | 27 |
|
| 4 | [is] essential for any | 8 |
|
| 5 | [is] essential for any | 8 |
|
| 6 | [is] essential for all | 7 |
|
| 7 | [is] essential for all | 7 |
|
| 8 | [is] essential for effective | 5 |
|
| 9 | [is] essential for this | 5 |
|
| 10 | [is] essential for normal | 5 |
|
| 11 | [is] essential for effective | 5 |
|
| 12 | [is] essential for normal | 5 |
|
| 13 | [is] essential for this | 5 |
|
