| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] the system is | 89 |
|
| 2 | if [art] system is | 27 |
|
| 3 | when [art] system is | 23 |
|
| 4 | [subord] a system is | 10 |
|
| 5 | because [art] system is | 10 |
|
| 6 | as [art] system is | 8 |
|
| 7 | once [art] system is | 5 |
|
