| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] [noun sg] period | 338 |
|
| 2 | [prep] a [adj] [noun sg] period | 338 |
|
| 3 | over a [adj] [noun sg] [noun] | 306 |
|
| 4 | over a [adj] [noun sg] [noun sg] | 301 |
|
| 5 | over [art] [adj] [noun sg] period | 196 |
|
| 6 | over a [adj] [noun sg] period | 144 |
|
| 7 | over a [adj] [noun sg] period | 144 |
|
| 8 | over a [adj] [noun] period | 144 |
|
