| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] once [prep] a | 63 |
|
| 2 | [prep] once [prep] a | 63 |
|
| 3 | at once [prep] a | 50 |
|
| 4 | at once [prep] a | 50 |
|
| 5 | [verb] once [prep] a | 49 |
|
| 6 | [noun] once [prep] a | 44 |
|
| 7 | [adv] once [prep] a | 40 |
|
| 8 | [conj] once [prep] a | 33 |
|
| 9 | [adv] once [prep] a | 31 |
|
| 10 | [noun sg] once [prep] a | 29 |
|
| 11 | [art] once [prep] a | 20 |
|
| 12 | [pron] once [prep] a | 20 |
|
| 13 | [art] once [prep] a | 20 |
|
| 14 | [vb pp] once [prep] a | 17 |
|
| 15 | [pers pn] once [prep] a | 16 |
|
| 16 | [be] once [prep] a | 13 |
|
| 17 | [subord] once [prep] a | 13 |
|
| 18 | [vb past] once [prep] a | 13 |
|
| 19 | be once [prep] a | 13 |
|
| 20 | [adj] once [prep] a | 12 |
|
| 21 | [coord] once [prep] a | 12 |
|
| 22 | a once [prep] a | 11 |
|
| 23 | [noun pl] once [prep] a | 11 |
|
| 24 | than once [prep] a | 11 |
|
| 25 | a once [prep] a | 11 |
|
| 26 | than once [prep] a | 11 |
|
| 27 | [was/were] once [prep] a | 10 |
|
| 28 | [adj] once [prep] a | 9 |
|
| 29 | every once [prep] a | 9 |
|
| 30 | and once [prep] a | 9 |
|
