| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | an [noun sg] for [noun] | 1473 |
|
| 2 | [noun sg] system for [noun] | 281 |
|
| 3 | an [noun sg] system for | 17 |
|
| 4 | an [noun sg] system [noun] | 14 |
|
