| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adj] once [prep] a | 6 |
|
| 2 | [be] [adj] once [prep] a | 6 |
|
| 3 | [adj] [noun] once [prep] a | 7 |
|
| 4 | [adj] at once [prep] a | 6 |
|
| 5 | [adj] [prep] once [prep] a | 6 |
|
| 6 | [adj] [prep] once [prep] a | 6 |
|
| 7 | [adj] [noun sg] once [prep] a | 6 |
|
| 8 | [adj] at once [prep] a | 6 |
|
| 9 | [adj] once [prep] a [noun] | 10 |
|
| 10 | [adj] once [prep] a [noun sg] | 10 |
|
| 11 | [adj] once [prep] a while | 6 |
|
| 12 | [adj] once [prep] a while | 6 |
|
