| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [prep] operation [prep] | 39 |
|
| 2 | [noun] [verb] [prep] operation [prep] | 31 |
|
| 3 | [noun] [verb] been [prep] operation | 30 |
|
| 4 | [noun] [verb] been [prep] [prep] | 12 |
|
