| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] system [Wh det] | 35 |
|
| 2 | [prep] a [noun] system which | 33 |
|
| 3 | [prep] a [noun sg] system [Wh det] | 32 |
|
| 4 | [prep] a [noun] system [Wh det] | 31 |
|
| 5 | in a [noun] system [Wh det] | 7 |
|
| 6 | in a [noun] system [Wh det] | 7 |
|
| 7 | of a [noun] system [Wh det] | 6 |
|
| 8 | of a [noun] system [Wh det] | 6 |
|
