| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary at [art] | 9 |
|
| 2 | [be] necessary at [art] | 9 |
|
| 3 | necessary [verb] at [art] | 15 |
|
| 4 | necessary [to-vb] at [art] | 15 |
|
| 5 | necessary to look at [art] | 13 |
|
| 6 | necessary look at [art] | 13 |
|
| 7 | necessary [noun] at [art] | 5 |
|
| 8 | necessary at [art] [noun] | 15 |
|
| 9 | necessary at [art] [noun sg] | 15 |
|
| 10 | necessary at [art] [adj] | 5 |
|
