| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [prep] once [verb] | 45 |
|
| 2 | [be] once [verb] by | 40 |
|
| 3 | [prep] once [verb] by | 13 |
|
| 4 | [be] [prep] [verb] by | 5 |
|
