| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] necessary [to-vb] [adv prt] [art] | 13 |
|
| 2 | [adv] necessary [verb] [adv prt] [art] | 11 |
|
| 3 | [adv] necessary [verb] [adv prt] the | 9 |
|
| 4 | [adv] necessary [verb] out [art] | 5 |
|
