| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once [prep] a [noun sg] a | 10 |
|
| 2 | once [prep] a [noun sg] a | 8 |
|
| 3 | once [prep] a time a | 5 |
|
| 4 | once upon a [noun sg] a | 5 |
|
| 5 | once upon a [noun sg] a | 5 |
|
