| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [prep] [be] [vb pp] | 2864 |
|
| 2 | system has [be] [vb pp] | 144 |
|
| 3 | system [prep] [be] [vb pp] | 55 |
|
| 4 | system has [prep] [be] | 14 |
|
