| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] [verb] [adj] [noun pl] | 427 |
|
| 2 | system is [vb pp] [verb] [adj] | 17 |
|
| 3 | system is [vb pp] [verb] [noun pl] | 5 |
|
