| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [subord] once [prep] [art] | 50 |
|
| 2 | [adv] [subord] once [prep] [art] | 50 |
|
| 3 | [adv] [subord] [adv] [prep] a | 48 |
|
| 4 | [adv] [subord] [adv] [prep] a | 42 |
|
| 5 | [adv] [subord] once [prep] a | 11 |
|
| 6 | [adv] [conj] once [prep] a | 8 |
|
| 7 | [adv] [subord] once [prep] a | 8 |
|
| 8 | [adv] [subord] once [prep] a | 8 |
|
