| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once [verb] as a | 47 |
|
| 2 | once [verb] as a | 38 |
|
| 3 | once [vb pp] as a | 37 |
|
| 4 | once [verb] as an | 9 |
|
| 5 | once [vb past] as a | 9 |
|
| 6 | once regarded as a | 6 |
|
| 7 | once regard as a | 6 |
|
| 8 | once used as a | 6 |
|
| 9 | once use as a | 6 |
|
| 10 | once work as a | 6 |
|
