| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] at [adv] [adv] a year | 14 |
|
| 2 | [noun] at least [adv] a year | 14 |
|
| 3 | [noun] at [adv] [adv] a year | 14 |
|
| 4 | [noun] at least [adv] a year | 14 |
|
| 5 | [noun] at [adv] [adv] a year | 14 |
|
| 6 | [noun] at [adv] once a year | 12 |
|
| 7 | [noun sg] at [adv] [adv] a year | 8 |
|
| 8 | [noun pl] at [adv] [adv] a year | 5 |
|
