| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] have been used [prep] | 14 |
|
| 2 | [Wh det] have [been] used [prep] | 14 |
|
| 3 | which have [been] used [prep] | 14 |
|
| 4 | [Wh det] have [been] used for | 5 |
|
| 5 | [Wh det] have [been] used for | 5 |
|
