| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [art] higher rate | 53 |
|
| 2 | at [art] higher rate | 53 |
|
| 3 | at a higher rate | 35 |
|
| 4 | at a higher rate | 35 |
|
| 5 | at the higher rate | 17 |
|
| 6 | at the higher rate | 17 |
|
