| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [is] [adv] used | 543 |
|
| 2 | system [is] [adv] [verb] | 154 |
|
| 3 | system [is] [adv] [vb pp] | 133 |
|
| 4 | system [be] [adv] used | 26 |
|
| 5 | system [is] [adv] used | 17 |
|
| 6 | system [is] [adv] use | 15 |
|
