| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be necessary to protect [art] | 16 |
|
| 2 | [be] necessary to protect the | 15 |
|
| 3 | [is] necessary to protect [art] | 8 |
|
| 4 | is necessary to protect [art] | 7 |
|
| 5 | was necessary to protect [art] | 6 |
|
| 6 | [was/were] necessary to protect [art] | 6 |
|
