| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [vb pp] at a [adj] rate | 10 |
|
| 2 | [is] [vb pp] at a [adj] rate | 5 |
|
| 3 | [is] [vb pp] at a [adj -er] rate | 5 |
|
