| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [art] cost of | 678 |
|
| 2 | at [art] cost of | 672 |
|
| 3 | at a cost of | 436 |
|
| 4 | at the cost of | 241 |
|
| 5 | at [art] costs of | 6 |
|
