| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] a [noun] [modal v] | 2399 |
|
| 2 | [adj] a [noun sg] [modal v] | 2389 |
|
| 3 | [adj] [art] system [modal v] | 56 |
|
| 4 | [adj] a system [modal v] | 51 |
|
