| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [be] in [noun] for | 97 |
|
| 2 | [verb] [be] in operation for | 20 |
|
| 3 | [vb past] [be] in operation [prep] | 12 |
|
| 4 | [vb past] [be] [prep] operation for | 5 |
|
| 5 | [vb past] [be] [prep] operation for | 5 |
|
| 6 | [vb past] [be] in operation for | 5 |
|
