| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] once a | 345 |
|
| 2 | [noun] once a | 311 |
|
| 3 | [adv] once a | 304 |
|
| 4 | [be] once a | 254 |
|
| 5 | be once a | 254 |
|
| 6 | [was/were] once a | 240 |
|
| 7 | was once a | 226 |
|
| 8 | [noun sg] once a | 217 |
|
| 9 | [verb] once a | 206 |
|
| 10 | [conj] once a | 139 |
|
| 11 | least once a | 118 |
|
| 12 | least once a | 118 |
|
| 13 | [prep] once a | 99 |
|
| 14 | [prep] once a | 99 |
|
| 15 | [vb pp] once a | 68 |
|
| 16 | at once a | 65 |
|
| 17 | at once a | 65 |
|
| 18 | [pron] once a | 64 |
|
| 19 | [noun pl] once a | 63 |
|
| 20 | [coord] once a | 62 |
|
| 21 | [pers pn] once a | 54 |
|
| 22 | only once a | 53 |
|
| 23 | only once a | 53 |
|
| 24 | [subord] once a | 50 |
|
| 25 | about once a | 40 |
|
| 26 | about once a | 40 |
|
| 27 | [vb base] once a | 39 |
|
| 28 | [adv prt] once a | 35 |
|
| 29 | and once a | 33 |
|
| 30 | than once a | 33 |
|
