| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have involved | 20 |
|
| 2 | which [vb past] involved | 13 |
|
| 3 | which had involved | 12 |
|
| 4 | which have involved | 5 |
|
| 5 | which [vb base] involved | 5 |
|
