| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | necessary for [art] [noun pl] [prep] [noun sg] | 7 |
|
| 2 | necessary for the [noun pl] [prep] [noun sg] | 7 |
|
| 3 | necessary for [art] [noun pl] of [noun sg] | 6 |
|
