| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] back [prep] [art] middle ages | 5 |
|
| 2 | [vb -s] back [prep] the middle [noun pl] | 5 |
|
| 3 | [vb -s] back to [art] middle [noun pl] | 5 |
|
| 4 | [vb -s] back to [art] middle [noun pl] | 5 |
|
| 5 | [vb -s] back [prep] [art] middle [noun pl] | 5 |
|
| 6 | [vb -s] back [prep] [art] middle [noun pl] | 5 |
|
