| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] for a | 6949 |
|
| 2 | [adv prt] for a | 2945 |
|
| 3 | back [prep] a | 1574 |
|
| 4 | back for [art] | 227 |
|
| 5 | back for [art] | 227 |
|
| 6 | back for a | 114 |
|
| 7 | back for a | 103 |
|
