| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [verb] been [prep] | 3069 |
|
| 2 | [verb] been operating [prep] | 50 |
|
| 3 | [noun] [verb] been operating | 43 |
|
| 4 | [noun] [verb] operating [prep] | 9 |
|
