| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] exchange rate | 281 |
|
| 2 | [prep] a [noun] rate | 178 |
|
| 3 | [prep] a exchange [noun] | 60 |
|
| 4 | [prep] a exchange rate | 28 |
|
