| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] a [noun] which | 464 |
|
| 2 | [verb] a system which | 56 |
|
| 3 | [vb base] [art] system which | 6 |
|
| 4 | [vb base] a system [Wh det] | 6 |
|
| 5 | [vb base] a system which | 6 |
|
| 6 | [vb base] a system [pron] | 6 |
|
