| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [art] rate | 722 |
|
| 2 | at [art] rate | 722 |
|
| 3 | at a rate | 408 |
|
| 4 | at a rate | 408 |
|
| 5 | at the rate | 314 |
|
| 6 | at the rate | 314 |
|
