| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] [det] a | 1017 |
|
| 2 | [vb pp] [prep] a system | 135 |
|
| 3 | [prep] [det] a system | 106 |
|
| 4 | [vb pp] [prep] [det] system | 40 |
|
