| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [is] essential if | 12 |
|
| 2 | [adj] is essential if | 12 |
|
| 3 | [det] [is] essential if | 11 |
|
| 4 | this [is] essential if | 10 |
|
| 5 | this [is] essential if | 10 |
|
