| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | system [vb mod] be [vb pp] [adv prt] [prep] | 13 |
|
| 2 | system [modal v] be [vb pp] [adv prt] [prep] | 9 |
|
| 3 | system [modal v] be [vb pp] out [prep] | 5 |
|
| 4 | system [modal v] be [vb pp] [adv prt] by | 5 |
|
