| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] once [prep] a | 33 |
|
| 2 | [conj] [adv] upon a | 15 |
|
| 3 | [conj] [adv] upon a | 14 |
|
| 4 | [conj] once upon [art] | 5 |
|
| 5 | [conj] once upon a | 5 |
|
