| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adv] [adj] period of | 57 |
|
| 2 | [prep] a [adv] [adj] period of | 57 |
|
| 3 | over a [adv] [adj] [noun] of | 21 |
|
| 4 | over a [adv] [adj] [noun sg] of | 20 |
|
| 5 | over [art] [adv] [adj] period of | 9 |
|
| 6 | over [art] [adv] [adj] period of | 9 |
|
| 7 | over a [adv] [adj] period [prep] | 8 |
|
| 8 | over a [adv] [adj] period of | 8 |
|
| 9 | over a [adv] [adj] period of | 8 |
|
| 10 | over a [adv] [adj] period [prep] | 8 |
|
| 11 | over a [adv] [adj] period of | 8 |
|
| 12 | over a [adv] [adj] period of | 8 |
|
