| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] once [prep] a | 30 |
|
| 2 | [conj] once in a | 20 |
|
| 3 | [subord] once [prep] a | 13 |
|
| 4 | [coord] once [prep] a | 12 |
|
| 5 | than once [prep] a | 11 |
|
| 6 | than once [prep] a | 11 |
|
| 7 | and once [prep] a | 9 |
|
| 8 | and once [prep] a | 9 |
|
| 9 | that once [prep] a | 8 |
|
| 10 | [that] once [prep] a | 8 |
|
| 11 | that once [prep] a | 8 |
|
| 12 | [conj] once upon a | 5 |
|
