| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] [noun] system [verb] be | 9 |
|
| 2 | a [adj] [noun sg] system [verb] be | 9 |
|
| 3 | a [adj] system [verb] be [verb] | 12 |
|
| 4 | a [adj] system [verb] be [vb pp] | 12 |
|
