| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [adv] a [noun] | 744 |
|
| 2 | at [adv] a [noun sg] | 725 |
|
| 3 | [prep] [adv] a week | 184 |
|
| 4 | [prep] [adv] a week | 184 |
|
| 5 | at [adv] [art] week | 44 |
|
| 6 | at [adv] a week | 43 |
|
| 7 | at [adv] a week | 43 |
|
| 8 | at [adv] a week | 43 |
|
