| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] at least a year | 12 |
|
| 2 | [noun] [prep] at [adv] a year | 12 |
|
| 3 | [noun] [prep] at [adv] a year | 12 |
|
| 4 | [noun] [prep] at [adv] a year | 12 |
|
| 5 | [noun] for at [adv] a year | 11 |
|
| 6 | [noun] for at [adv] a year | 11 |
|
| 7 | [noun sg] [prep] at [adv] a year | 10 |
|
