| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] a [noun sg] [noun sg] | 888 |
|
| 2 | but a [noun sg] [noun sg] | 309 |
|
| 3 | but [not/n't] a [noun sg] | 129 |
|
| 4 | but [not/n't] [noun sg] [noun sg] | 27 |
|
