| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [noun] system for | 20 |
|
| 2 | and [noun] system for | 20 |
|
| 3 | [conj] [noun] system for | 20 |
|
| 4 | and [noun] system for | 20 |
|
| 5 | [conj] [noun sg] system for | 19 |
|
