| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adv] long period | 21 |
|
| 2 | over [art] [adv] longer period | 12 |
|
| 3 | over [art] [adv] long period | 10 |
|
| 4 | over [art] much long period | 9 |
|
