| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been use at | 16 |
|
| 2 | have [been] use at | 16 |
|
| 3 | [verb] [been] used at | 16 |
|
| 4 | has [been] use at | 8 |
|
| 5 | [vb -s] [been] use at | 8 |
|
