| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] at [art] [adj -er] rate | 10 |
|
| 2 | is [verb] at a [adj -er] rate | 10 |
|
| 3 | is [verb] at a [adj -er] rate | 10 |
|
| 4 | is [vb pp] at [art] [adj -er] rate | 5 |
|
| 5 | is [v-ing] at [art] [adj -er] rate | 5 |
|
