| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a | 36357 |
|
| 2 | back [prep] a | 1802 |
|
| 3 | [adv] back [prep] | 1636 |
|
| 4 | [adv] back a | 11 |
|
