| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once upon a [noun] | 163 |
|
| 2 | once upon a [noun sg] | 163 |
|
| 3 | once a [noun] [noun sg] | 104 |
|
| 4 | upon a [noun] [noun sg] | 83 |
|
