| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [is] [conj] | 16533 |
|
| 2 | [noun] [is] necessary | 847 |
|
| 3 | [is] necessary [conj] | 247 |
|
| 4 | [noun] necessary [conj] | 31 |
|
