| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] which [verb] [vb pp] [prep] [art] | 561 |
|
| 2 | system [pron] [verb] [vb pp] [prep] [art] | 10 |
|
| 3 | system which [verb] [verb] [prep] [art] | 8 |
|
| 4 | system which [verb] [vb pp] [prep] [art] | 7 |
|
