| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been operating [art] | 8 |
|
| 2 | [verb] been operating [art] | 8 |
|
| 3 | been operating [prep] [art] | 18 |
|
| 4 | been operating [prep] [art] | 18 |
|
| 5 | been operating in [art] | 5 |
|
| 6 | been operating in [art] | 5 |
|
| 7 | been operating [art] [noun] | 6 |
|
| 8 | been operating [art] [noun sg] | 5 |
|
