| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] for [adj] [noun] [prep] | 70 |
|
| 2 | necessary for [adj] [noun] [prep] | 44 |
|
| 3 | [is] necessary for [adj] [noun] | 40 |
|
| 4 | [is] necessary for [noun] [prep] | 8 |
|
