| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but [not/n't] [prep] | 1876 |
|
| 2 | but [prep] an | 475 |
|
| 3 | [not/n't] [prep] an | 305 |
|
| 4 | but [not/n't] an | 34 |
|
