| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] [noun] system [vb -s] a | 24 |
|
| 2 | [art] [noun sg] system [vb -s] a | 23 |
|
| 3 | the [noun] system [vb -s] a | 19 |
|
| 4 | the [noun] system [vb -s] a | 19 |
|
| 5 | [art] [noun] system has a | 7 |
|
