| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [verb] | 178478 |
|
| 2 | not [vb pp] | 35063 |
|
| 3 | [adv] required | 1257 |
|
| 4 | not require | 917 |
|
| 5 | [not/n't] required | 354 |
|
| 6 | not required | 354 |
|
