| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pos pn] [noun sg] [prep] a [adj] period | 21 |
|
| 2 | their [noun] [prep] a [adj] period | 15 |
|
| 3 | [pos pn] [noun] over a [adj] period | 10 |
|
| 4 | [pos pn] [noun] for a [adj] period | 7 |
|
