| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] which [vb mod] allow | 182 |
|
| 2 | system which [vb mod] [verb] | 106 |
|
| 3 | system [pron] [vb mod] allow | 5 |
|
| 4 | system which [modal v] allow | 5 |
|
