| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [prep] a [adj] | 74 |
|
| 2 | operate [prep] a [adj] | 48 |
|
| 3 | which operate [prep] a | 10 |
|
| 4 | which operate [prep] [adj] | 10 |
|
