| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [subord] once [art] month | 12 |
|
| 2 | [adv] [subord] once a month | 12 |
|
| 3 | [adv] [subord] once [art] month | 12 |
|
| 4 | [adv] [subord] once [art] month | 12 |
|
| 5 | [adv] [subord] once a month | 12 |
|
| 6 | [adv] than once [art] month | 9 |
|
| 7 | less [subord] once [art] month | 6 |
|
| 8 | less [subord] once [art] month | 6 |
|
