| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | often [prep] the expense [prep] | 10 |
|
| 2 | often [prep] the expense of | 10 |
|
| 3 | often at the expense [prep] | 10 |
|
| 4 | often [prep] the expense of | 10 |
|
