| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun] over [art] period [prep] | 10 |
|
| 2 | a [noun sg] over [art] period [prep] | 10 |
|
| 3 | a [noun] over [art] period of | 9 |
|
| 4 | a [noun] over a period [prep] | 8 |
|
