| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [adj] once [prep] a | 5 |
|
| 2 | [be] [adj] once [prep] a | 5 |
|
| 3 | [be] [adj] once a [noun] | 5 |
|
| 4 | [be] [adj] once a [noun sg] | 5 |
|
