| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] who [vb past] [been] at [noun] | 6 |
|
| 2 | [noun] who [vb past] been at [noun] | 6 |
|
| 3 | [noun] who [vb past] [been] at [noun] | 6 |
|
| 4 | [noun] who had [been] at [noun] | 5 |
|
