| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [prep] once [art] [noun] | 17 |
|
| 2 | [det] [prep] once [art] [noun] | 17 |
|
| 3 | [det] at once [art] [noun] | 16 |
|
| 4 | [det] at once [art] [noun] | 16 |
|
| 5 | [det] [be] once [art] [noun] | 14 |
|
| 6 | [det] be once [art] [noun] | 14 |
|
| 7 | [det] [noun] once [art] [noun] | 12 |
|
| 8 | [det] was once [art] [noun] | 10 |
|
| 9 | [det] [was/were] once [art] [noun] | 10 |
|
| 10 | [det] [noun sg] once [art] [noun] | 8 |
|
