| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a [adj] period [prep] | 291 |
|
| 2 | [noun] over a [adj] [noun] [prep] | 256 |
|
| 3 | [noun] over [art] [adj] period [prep] | 113 |
|
| 4 | [noun] over [art] [adj] period [prep] | 113 |
|
| 5 | [noun] over a [adj] period [prep] | 97 |
|
| 6 | [noun] over a [adj] period [prep] | 97 |
|
