| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back [prep] a [num] [noun sg] | 15 |
|
| 2 | back [prep] a [num] [noun sg] | 15 |
|
| 3 | back from a [num] [noun sg] | 7 |
|
| 4 | back from a [num] [noun sg] | 7 |
|
