| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but [prep] an [noun sg] | 239 |
|
| 2 | but [not/n't] [prep] [noun sg] | 236 |
|
| 3 | [not/n't] [prep] an [noun sg] | 169 |
|
| 4 | but [not/n't] [prep] an | 20 |
|
| 5 | but [not/n't] an [noun sg] | 7 |
|
