| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] a [adj] period | 29 |
|
| 2 | after a [adj] period | 20 |
|
| 3 | [subord] a short period | 7 |
|
| 4 | [subord] a short period | 6 |
|
| 5 | [subord] a [adj -er] period | 5 |
|
| 6 | [subord] a long period | 5 |
|
