| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | system is [conj] it [verb] | 16 |
|
| 2 | system is [conj] it [vb -s] | 16 |
|
| 3 | system is [that] it [verb] | 15 |
|
| 4 | system is that it [verb] | 15 |
|
| 5 | system is that it [verb] | 15 |
|
