| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back [prep] a few days | 6 |
|
| 2 | back [prep] [art] few days | 6 |
|
| 3 | back in [art] few days | 5 |
|
| 4 | back in [art] few days | 5 |
|
