| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a week at | 25 |
|
| 2 | [adv] a week at | 25 |
|
| 3 | once a week at | 12 |
|
| 4 | once a week at | 12 |
|
| 5 | twice a week at | 6 |
|
| 6 | twice a week at | 6 |
|
