| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] once [coord] [adv] a year | 7 |
|
| 2 | [noun] once [coord] [adv] a year | 7 |
|
| 3 | [adv] once [coord] [adv] a year | 6 |
|
| 4 | [adv] once [coord] [adv] a year | 5 |
|
| 5 | once [coord] [adv] a year [prep] | 5 |
|
| 6 | once [coord] [adv] a year [prep] | 5 |
|
| 7 | once [coord] [adv] a year [pron] | 5 |
|
