| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be essential [subord] the [noun sg] | 24 |
|
| 2 | be essential if [art] [noun sg] | 19 |
|
| 3 | is essential [subord] [art] [noun sg] | 15 |
|
| 4 | be essential [subord] [art] [noun sg] | 7 |
|
| 5 | be essential [subord] a [noun sg] | 5 |
|
