| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back [prep] [adv] a [noun] | 13 |
|
| 2 | back [prep] [adv] a [noun] | 13 |
|
| 3 | back [prep] [adv] a [noun sg] | 13 |
|
| 4 | back [prep] [adv] a [noun] | 11 |
|
