| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] once [prep] a [noun sg] | 8 |
|
| 2 | [adj] once [prep] a [noun] | 8 |
|
| 3 | [adj] [adv] [prep] a while | 7 |
|
| 4 | [adj] once [prep] a while | 6 |
|
| 5 | [adj] once [prep] a while | 6 |
|
| 6 | [adj] [adv] [prep] a while | 6 |
|
| 7 | [adj] once [prep] [art] while | 6 |
|
| 8 | [adj] once [prep] a while | 6 |
|
| 9 | [adj] once [prep] a while | 6 |
|
