| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been operating [prep] [art] | 18 |
|
| 2 | [been] operating [prep] [art] | 18 |
|
| 3 | [been] operating [prep] the | 9 |
|
| 4 | [been] operating [prep] a | 7 |
|
| 5 | [been] operating in [art] | 5 |
|
| 6 | [been] operating in [art] | 5 |
|
