| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [noun] [prep] a period of | 18 |
|
| 2 | [coord] [noun] [prep] a period of | 18 |
|
| 3 | [coord] [noun] over a [noun] of | 14 |
|
| 4 | [coord] [noun] over a [noun sg] of | 13 |
|
| 5 | [coord] [noun] over [art] period of | 10 |
|
| 6 | [coord] [noun] over a period [prep] | 9 |
|
| 7 | [coord] [noun] over a period of | 9 |
|
| 8 | [conj] [noun] over a period of | 9 |
|
| 9 | [coord] [noun] over a period of | 9 |
|
