| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is essential if [art] [noun sg] | 11 |
|
| 2 | is essential if [art] [noun sg] | 11 |
|
| 3 | is essential if [art] [noun sg] | 11 |
|
| 4 | is essential if the [noun sg] | 10 |
|
| 5 | is essential if the [noun sg] | 10 |
|
