| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [adv] [vb past] | 3672 |
|
| 2 | system which [vb past] | 188 |
|
| 3 | system which [adv] | 50 |
|
| 4 | system [adv] [vb past] | 39 |
|
