| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] [noun] | 1283588 |
|
| 2 | necessary [prep] [noun] | 606 |
|
| 3 | necessary [prep] [adj] | 522 |
|
| 4 | necessary [adj] [noun] | 452 |
|
