| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] [noun] period | 142 |
|
| 2 | over a [adj] [noun] in | 41 |
|
| 3 | a [adj] [noun] period in | 19 |
|
| 4 | over a [adj] period in | 6 |
|
