| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period | 1796 |
|
| 2 | [prep] a specified [noun] | 331 |
|
| 3 | [prep] a specified [noun sg] | 328 |
|
| 4 | [prep] [art] specified period | 53 |
|
| 5 | [prep] [art] specified period | 53 |
|
| 6 | [prep] a specified period | 48 |
|
| 7 | [prep] a specified period | 48 |
|
