| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] which have been operating [prep] | 5 |
|
| 2 | [noun] which have [been] operating [prep] | 5 |
|
| 3 | [noun] which have be operating [prep] | 5 |
|
| 4 | [noun] which have [be] operating [prep] | 5 |
|
