| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] [conj] the [adj] system | 9 |
|
| 2 | is [vb pp] [conj] the [adj] system | 8 |
|
| 3 | is [verb] [that] the [adj] system | 6 |
|
| 4 | is [verb] that the [adj] system | 6 |
|
| 5 | is [verb] that the [adj] system | 6 |
|
