| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once [prep] a [noun] [verb] | 20 |
|
| 2 | once [prep] a [noun sg] [verb] | 20 |
|
| 3 | [adv] [prep] a time [verb] | 15 |
|
| 4 | [adv] [prep] a time [verb] | 12 |
|
| 5 | once [prep] [art] time [verb] | 7 |
|
| 6 | once [prep] a time [verb] | 7 |
|
| 7 | once [prep] a time [verb] | 7 |
|
| 8 | once [prep] [art] time [verb] | 7 |
|
| 9 | once [prep] a time [verb] | 7 |
|
