No | Pattern | Freq | Relations |
---|---|---|---|
1 | [verb] [adv] over a long period | 7 | |
2 | [vb pp] [adv] over a long period | 5 | |
3 | [adv] over a long period [prep] | 8 | |
4 | [adv] over a long period [prep] | 8 | |
5 | [adv] over a long period of | 7 | |
6 | [adv] over a long period of | 7 |