| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | system [Wh det] [vb mod] [adv] [vb infin] [noun] | 5 |
|
| 2 | system which [vb mod] [adv] [vb infin] [noun] | 5 |
|
| 3 | system [Wh det] [vb mod] [adv] [vb infin] [noun] | 5 |
|
