| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] [noun sg] | 225690 |
|
| 2 | back [prep] [adj] [noun sg] | 1195 |
|
| 3 | back [prep] a [noun sg] | 884 |
|
| 4 | back [prep] a [adj] | 574 |
|
| 5 | back a [adj] [noun sg] | 168 |
|
