| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [prep] [adv] a | 336 |
|
| 2 | [prep] [adv] a week | 184 |
|
| 3 | [prep] [adv] a week | 184 |
|
| 4 | [prep] [prep] a week | 5 |
|
