| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but [adv] a [noun sg] | 816 |
|
| 2 | but [adv] a [noun sg] | 685 |
|
| 3 | [conj] once a [noun sg] | 120 |
|
| 4 | but once [art] [noun sg] | 63 |
|
| 5 | but once a [noun] | 16 |
|
| 6 | but once a [noun sg] | 16 |
|
