| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once [prep] a | 498 |
|
| 2 | once [prep] a | 498 |
|
| 3 | [adv] upon a | 229 |
|
| 4 | once upon [art] | 165 |
|
| 5 | once upon a | 163 |
|
