| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that once [prep] [art] | 12 |
|
| 2 | [that] once [prep] [art] | 12 |
|
| 3 | [that] once [prep] a | 8 |
|
| 4 | [that] once [prep] a | 8 |
|
| 5 | [that] once in [art] | 6 |
|
