| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] [prep] [art] | 5333 |
|
| 2 | operating [prep] [art] | 557 |
|
| 3 | [been] operating [prep] | 60 |
|
| 4 | [been] operating [art] | 8 |
|
