| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] system [vb -s] a | 56 |
|
| 2 | [noun] system has a | 14 |
|
| 3 | operating system [vb -s] a | 5 |
|
| 4 | [noun] system includes a | 5 |
|
| 5 | operating system [vb -s] a | 5 |
|
