| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] at a | 23 |
|
| 2 | who [vb base] at a | 11 |
|
| 3 | who meet at a | 9 |
|
| 4 | who work at a | 8 |
|
| 5 | who met at a | 6 |
|
| 6 | who [vb -s] at a | 5 |
|
