| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] than once a [noun] | 30 |
|
| 2 | [adv] than once a [noun sg] | 29 |
|
| 3 | [adv] than [adv] a year | 11 |
|
| 4 | [adv] than once a year | 5 |
|
| 5 | [adv] than once [art] year | 5 |
|
| 6 | [adv] than once a year | 5 |
|
| 7 | [adv] [subord] once a year | 5 |
|
| 8 | [adv] [conj] once a year | 5 |
|
