| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once [prep] a [noun sg] [art] | 18 |
|
| 2 | once [prep] a [noun sg] [art] | 18 |
|
| 3 | once [prep] a time [art] | 11 |
|
| 4 | once upon a [noun sg] [art] | 11 |
|
| 5 | once upon a [noun sg] [art] | 11 |
|
| 6 | once [prep] a [noun sg] a | 10 |
|
| 7 | once [prep] a [noun sg] the | 8 |
|
| 8 | once [prep] a [noun sg] the | 8 |
|
| 9 | once [prep] a [noun sg] a | 8 |
|
| 10 | once in a [noun sg] [art] | 5 |
|
| 11 | once [prep] a while [art] | 5 |
|
| 12 | once in a [noun sg] [art] | 5 |
|
