| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [art] once [prep] a | 6 |
|
| 2 | be [art] once [prep] a | 6 |
|
| 3 | [art] [noun] once [prep] a | 16 |
|
| 4 | [art] [noun sg] once [prep] a | 15 |
|
| 5 | [art] once [prep] a [noun sg] | 19 |
|
| 6 | [art] once [prep] a [noun] | 19 |
|
| 7 | [art] once [prep] a while | 9 |
|
| 8 | [art] once [prep] a while | 9 |
|
| 9 | [art] once [prep] a lifetime | 8 |
|
| 10 | [art] once [prep] a lifetime | 8 |
|
