| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is necessary [verb] such [noun pl] [conj] | 5 |
|
| 2 | is necessary [verb] such [noun pl] [conj] | 5 |
|
| 3 | is necessary [to-vb] such [noun pl] [conj] | 5 |
|
