| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a [unc] | 719 |
|
| 2 | [noun] [prep] a week | 680 |
|
| 3 | [prep] a week [unc] | 124 |
|
| 4 | [noun] [prep] week [unc] | 17 |
|
| 5 | [noun] a week [unc] | 11 |
|
