| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] once a | 311 |
|
| 2 | [n mass] [adv] a | 92 |
|
| 3 | [n mass] [adv] a | 72 |
|
| 4 | [n mass] once [art] | 11 |
|
| 5 | [n mass] once a | 6 |
|
