| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | exchange of [noun] [prep] [noun] | 98 |
|
| 2 | an exchange of [noun] [prep] | 49 |
|
| 3 | an exchange [noun] [prep] [noun] | 15 |
|
| 4 | an exchange of [noun] [noun] | 9 |
|
