No | Pattern | Freq | Relations |
---|---|---|---|
1 | [prep] a long period of | 152 | |
2 | [prep] a long period of | 140 | |
3 | over a long period of | 84 | |
4 | for a long period of | 21 | |
5 | after a long period of | 16 | |
6 | [prep] a longer period of | 12 | |
7 | of a long period of | 11 | |
8 | to a long period of | 5 |