| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | than [art] [adj] system | 32 |
|
| 2 | than the [adj] system | 22 |
|
| 3 | than the [adj] system | 22 |
|
| 4 | than a [adj] system | 10 |
|
| 5 | than a [adj] system | 10 |
|
