| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once upon a [noun sg] | 163 |
|
| 2 | [conj] once a [noun sg] | 120 |
|
| 3 | [conj] upon a [noun sg] | 14 |
|
| 4 | [conj] once upon a | 5 |
|
