| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] in operation at [art] | 6 |
|
| 2 | [noun pl] in operation at [art] | 6 |
|
| 3 | in operation at [art] [noun] | 14 |
|
| 4 | in operation at [art] [noun sg] | 10 |
|
