No | Pattern | Freq | Relations |
---|---|---|---|
1 | [verb] [prep] a long period of | 31 | |
2 | [vb pp] [prep] a long period of | 24 | |
3 | [verb] over a long period of | 13 | |
4 | [verb] over a long period of | 13 | |
5 | [verb] for a long period of | 7 | |
6 | [verb] for a long period of | 7 |