| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] operate for | 13 |
|
| 2 | has [been] for [adv] | 10 |
|
| 3 | [been] operate for [adv] | 7 |
|
| 4 | has [been] operate [adv] | 6 |
|
