| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once a [noun sg] | 1606 |
|
| 2 | once a [noun] | 1564 |
|
| 3 | once a week | 483 |
|
| 4 | once a week | 483 |
|
| 5 | once a year | 253 |
|
| 6 | once a year | 253 |
|
| 7 | once a month | 200 |
|
| 8 | once a month | 199 |
|
| 9 | once a day | 79 |
|
| 10 | once a day | 79 |
|
| 11 | once a fortnight | 76 |
|
| 12 | once a fortnight | 76 |
|
| 13 | once an [noun] | 69 |
|
| 14 | once a [noun prp] | 16 |
|
| 15 | once a quarter | 9 |
|
| 16 | once a member | 9 |
|
| 17 | once a member | 9 |
|
| 18 | once a quarter | 9 |
|
| 19 | once a person | 9 |
|
| 20 | once a person | 9 |
|
| 21 | once a woman | 8 |
|
| 22 | once a man | 7 |
|
| 23 | once a woman | 7 |
|
| 24 | once a term | 7 |
|
| 25 | once a term | 7 |
|
| 26 | once a [n mass] | 7 |
|
| 27 | once a man | 7 |
|
| 28 | once a student | 6 |
|
| 29 | once a student | 6 |
|
