| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [prep] operation [prep] some | 5 |
|
| 2 | have [been] [prep] operation for some | 5 |
|
| 3 | have been [prep] operation [prep] some | 5 |
|
| 4 | have [been] in operation [prep] some | 5 |
|
| 5 | have [been] in operation [prep] some | 5 |
|
