| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [adv] [prep] a | 1088 |
|
| 2 | [pron] once [prep] a | 20 |
|
| 3 | it once [prep] [art] | 10 |
|
| 4 | it once [prep] a | 6 |
|
