| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] [noun] [prep] | 506 |
|
| 2 | over a [adj] period [prep] | 176 |
|
| 3 | over a [adj] [noun] period | 142 |
|
| 4 | a [adj] [noun] period [prep] | 103 |
|
| 5 | over a [noun] period [prep] | 6 |
|
