| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | system and a [noun sg] [prep] | 19 |
|
| 2 | system and a [noun] of | 14 |
|
| 3 | system and a [noun] [prep] | 12 |
|
| 4 | systems and a [noun] [prep] | 9 |
|
