| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once in a | 197 |
|
| 2 | once upon a | 163 |
|
| 3 | once on a | 19 |
|
| 4 | once as a | 17 |
|
| 5 | once with a | 17 |
|
| 6 | once by a | 12 |
|
| 7 | once to a | 9 |
|
| 8 | once at a | 7 |
|
| 9 | once for a | 6 |
|
| 10 | once during a | 5 |
|
