| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] once [prep] a [noun] | 29 |
|
| 2 | [conj] once [prep] a [noun sg] | 27 |
|
| 3 | [conj] [adv] [prep] a time | 22 |
|
| 4 | [conj] [adv] [prep] a time | 21 |
|
| 5 | [conj] once [prep] a time | 5 |
|
| 6 | [conj] once [prep] a time | 5 |
|
| 7 | [conj] once [prep] a time | 5 |
|
| 8 | [conj] once [prep] [art] time | 5 |
|
| 9 | [conj] once [prep] [art] time | 5 |
|
