| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] at an [adj] rate | 111 |
|
| 2 | [verb] at an unprecedented [noun] | 8 |
|
| 3 | [verb] at an unprecedented [noun sg] | 8 |
|
| 4 | [verb] at a unprecedented rate | 5 |
|
| 5 | [verb] [prep] an unprecedented rate | 5 |
|
| 6 | [verb] at [art] unprecedented rate | 5 |
|
| 7 | [verb] at [art] unprecedented rate | 5 |
|
| 8 | [verb] at an unprecedented rate | 5 |
|
