| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] used [prep] a | 15 |
|
| 2 | have been use [prep] a | 15 |
|
| 3 | have [been] use [prep] a | 13 |
|
| 4 | have [been] use as a | 9 |
|
