| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [det] [noun] | 353826 |
|
| 2 | back [prep] [noun] | 10787 |
|
| 3 | back [prep] [det] | 1244 |
|
| 4 | back [det] [noun] | 310 |
|
