| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] [unc] | 107637 |
|
| 2 | back [prep] [noun] | 10787 |
|
| 3 | back [prep] [unc] | 129 |
|
| 4 | back [noun] [unc] | 31 |
|
