| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] once [prep] a | 55 |
|
| 2 | [prep] once [prep] a | 55 |
|
| 3 | [verb] once [prep] a | 45 |
|
| 4 | at once [prep] a | 42 |
|
| 5 | at once [prep] a | 42 |
|
| 6 | [noun] once [prep] a | 41 |
|
| 7 | [adv] once [prep] a | 39 |
|
| 8 | [conj] once [prep] a | 30 |
|
| 9 | [adv] once [prep] a | 30 |
|
| 10 | [noun sg] once [prep] a | 26 |
|
| 11 | [art] once [prep] a | 20 |
|
| 12 | [art] once [prep] a | 20 |
|
| 13 | [pron] once [prep] a | 19 |
|
| 14 | [vb pp] once [prep] a | 15 |
|
| 15 | [pers pn] once [prep] a | 15 |
|
| 16 | be once [prep] a | 13 |
|
| 17 | [be] once [prep] a | 13 |
|
| 18 | [adj] once [prep] a | 12 |
|
| 19 | [vb past] once [prep] a | 12 |
|
| 20 | [coord] once [prep] a | 12 |
|
| 21 | a once [prep] a | 11 |
|
| 22 | [noun pl] once [prep] a | 11 |
|
| 23 | a once [prep] a | 11 |
|
| 24 | [subord] once [prep] a | 10 |
|
| 25 | [was/were] once [prep] a | 10 |
|
| 26 | every once [prep] a | 9 |
|
| 27 | [adj] once [prep] a | 9 |
|
| 28 | and once [prep] a | 9 |
|
| 29 | [adv prt] once [prep] a | 9 |
|
| 30 | and once [prep] a | 9 |
|
