| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] at [art] rate | 11 |
|
| 2 | [vb past] at [art] rate | 11 |
|
| 3 | [vb past] at a rate | 8 |
|
| 4 | [vb past] at a rate | 8 |
|
