| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] [subord] | 42357 |
|
| 2 | back [prep] [noun] | 10787 |
|
| 3 | back [prep] [subord] | 61 |
|
| 4 | back [noun] [subord] | 33 |
|
