| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | than [prep] a [noun sg] | 437 |
|
| 2 | once [prep] a [noun sg] | 411 |
|
| 3 | than once a [noun sg] | 30 |
|
| 4 | than once [prep] a | 11 |
|
