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