| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have once [been] [prep] | 11 |
|
| 2 | have once been [prep] | 11 |
|
| 3 | had once [been] [prep] | 10 |
|
| 4 | have once [been] to | 6 |
|
| 5 | have once [been] to | 6 |
|
