| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [adj] [adj] period | 14 |
|
| 2 | at [det] [adj] period | 14 |
|
| 3 | at [adj] [adj] period | 12 |
|
| 4 | at any [adj] period | 8 |
|
| 5 | at any [adj] period | 8 |
|
