| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have [vb pp] in the [num] | 13 |
|
| 2 | which [vb past] [vb pp] in the [num] | 10 |
|
| 3 | which had [vb pp] in the [num] | 10 |
|
| 4 | which [verb] [vb pp] in the 1980s | 5 |
|
