| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] back at least [adj] [noun] | 6 |
|
| 2 | [vb -s] back at [adv] [adj] [noun] | 6 |
|
| 3 | [vb -s] back at [adv] [num] [noun] | 6 |
|
| 4 | [vb -s] back at [adv] [adj] [noun pl] | 6 |
|
| 5 | [vb -s] back at [adv] [adj] year | 5 |
|
| 6 | [vb -s] back at [adv] [adj] years | 5 |
|
