| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once [verb] to a | 30 |
|
| 2 | once [verb] to a | 27 |
|
| 3 | once [vb pp] to a | 15 |
|
| 4 | once [vb past] to a | 14 |
|
| 5 | once belong to a | 5 |
|
