| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have [been] [vb pp] for | 44 |
|
| 2 | which have [been] [vb pp] for | 44 |
|
| 3 | which have been [vb pp] for | 44 |
|
| 4 | which have [been] used for | 5 |
|
| 5 | which have [been] developed for | 5 |
|
