| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have once [been] [noun prp] [noun] | 6 |
|
| 2 | [vb past] once [been] [noun prp] [noun] | 6 |
|
| 3 | had once [been] [noun prp] [noun] | 6 |
|
| 4 | [verb] once [been] [noun prp] [noun] | 6 |
|
