| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period | 519 |
|
| 2 | over a long period | 232 |
|
| 3 | [prep] a longer period | 86 |
|
| 4 | [prep] a longer period | 86 |
|
| 5 | over a longer [noun] | 67 |
|
| 6 | over a [adj -er] period | 56 |
|
| 7 | over [art] longer period | 52 |
|
| 8 | over [art] longer period | 52 |
|
| 9 | over a longer period | 51 |
|
| 10 | over a longer period | 51 |
|
