| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] six months [prep] a [noun] | 12 |
|
| 2 | [prep] six months [prep] a [noun] | 12 |
|
| 3 | [prep] six months [coord] a [noun] | 6 |
|
| 4 | [prep] six months [conj] a [noun] | 6 |
|
