| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] exchange for | 7 |
|
| 2 | [prep] [art] exchange for | 7 |
|
| 3 | [prep] [art] exchange for | 6 |
|
| 4 | [prep] the exchange for | 5 |
|
| 5 | [prep] the exchange for | 5 |
|
