| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] [noun] [prep] a period | 52 |
|
| 2 | [prep] [adj] [noun pl] [prep] a period | 25 |
|
| 3 | [prep] [adj] [noun sg] [prep] a period | 25 |
|
| 4 | [prep] [adj] [noun] over a period | 25 |
|
| 5 | [prep] [adj] [noun] for a period | 14 |
|
| 6 | of [adj] [noun] [prep] a period | 14 |
|
| 7 | in [adj] [noun] [prep] a period | 10 |
|
| 8 | [prep] [adj] [noun] in a period | 5 |
|
| 9 | for [adj] [noun] [prep] a period | 5 |
|
