No | Pattern | Freq | Relations |
---|---|---|---|
1 | [verb] [prep] [art] long period of | 38 | |
2 | [verb] [prep] a long period of | 34 | |
3 | [verb] [prep] [art] long period of | 32 | |
4 | [vb pp] [prep] [art] long period of | 30 | |
5 | [verb] over [art] long period of | 15 | |
6 | [verb] for [art] long period of | 10 |