| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [vb past] at a | 13 |
|
| 2 | this [vb past] at a | 9 |
|
| 3 | this [vb past] at a | 9 |
|
| 4 | [num] [vb past] at a | 8 |
|
