| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period | 519 |
|
| 2 | [prep] a [adj -er] period | 146 |
|
| 3 | [prep] a [adj -er] period | 146 |
|
| 4 | over a [adj -er] [noun] | 121 |
|
| 5 | over [art] [adj -er] period | 57 |
|
| 6 | over [art] [adj -er] period | 57 |
|
| 7 | over a [adj -er] period | 56 |
|
| 8 | over a [adj -er] period | 56 |
|
