| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] | 430257 |
|
| 2 | [not/n't] a [noun] | 9521 |
|
| 3 | [not/n't] [prep] [noun] | 6612 |
|
| 4 | [not/n't] [prep] a | 1837 |
|
