| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] [noun sg] | 75113 |
|
| 2 | back [prep] a [noun] | 1030 |
|
| 3 | back [prep] a [noun sg] | 988 |
|
| 4 | back [prep] [noun] [noun sg] | 478 |
|
| 5 | back a [noun] [noun sg] | 15 |
|
