| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have be operated [prep] | 13 |
|
| 2 | have been operated [prep] | 13 |
|
| 3 | have be operated [prep] | 5 |
|
| 4 | have be operated by | 5 |
|
| 5 | had be operated [prep] | 5 |
|
| 6 | have be operated by | 5 |
|
