| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] a long period [prep] | 8 |
|
| 2 | [verb] [adv] a long period [prep] | 8 |
|
| 3 | [verb] [adv] a long period of | 7 |
|
| 4 | [verb] [adv] a long period of | 7 |
|
| 5 | [noun] [verb] [adv] a long period | 7 |
|
| 6 | [verb] [adv] [prep] a long period | 21 |
|
| 7 | [verb] [adv] [prep] a long period | 21 |
|
| 8 | [verb] [adv] over a long period | 11 |
|
| 9 | [verb] [adv] over a long period | 11 |
|
| 10 | [verb] [adv] for a long period | 6 |
|
| 11 | [verb] [adv] for a long period | 6 |
|
