| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once [prep] a | 498 |
|
| 2 | once [prep] a | 474 |
|
| 3 | once in a | 205 |
|
| 4 | once in a | 205 |
|
| 5 | once upon a | 163 |
|
| 6 | once upon a | 163 |
|
| 7 | once [prep] an | 24 |
|
| 8 | once as a | 20 |
|
| 9 | once as a | 20 |
|
| 10 | once on a | 19 |
|
| 11 | once on a | 19 |
|
| 12 | once with a | 17 |
|
| 13 | once with a | 17 |
|
| 14 | once by a | 15 |
|
| 15 | once by a | 15 |
|
| 16 | once to a | 10 |
|
| 17 | once to a | 10 |
|
| 18 | once for a | 7 |
|
| 19 | once for a | 7 |
|
| 20 | once into a | 7 |
|
| 21 | once at a | 7 |
|
| 22 | once into a | 7 |
|
| 23 | once at a | 7 |
|
| 24 | once during a | 5 |
|
| 25 | once from a | 5 |
|
| 26 | once during a | 5 |
|
| 27 | once from a | 5 |
|
