| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [noun] [prep] a [det] years | 7 |
|
| 2 | at [noun] [prep] a [adj] years | 7 |
|
| 3 | at [noun] [prep] a few years | 7 |
|
| 4 | at [noun] [prep] a [adj] years | 7 |
|
| 5 | at [noun] [prep] a few years | 7 |
|
