| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | system which be [vb pp] [prep] the | 11 |
|
| 2 | system which be [verb] [prep] the | 11 |
|
| 3 | system which be [verb] [prep] the | 11 |
|
| 4 | system which be [verb] [prep] the | 9 |
|
| 5 | system which is [verb] [prep] the | 7 |
|
