No | Pattern | Freq | Relations |
---|---|---|---|
1 | over a [adv] long period [prep] | 5 | |
2 | over a [adv] long period of | 5 | |
3 | over a [adv] long period of | 5 | |
4 | over a [adv] long period [prep] | 5 | |
5 | [noun] over a [adv] long period | 8 | |
6 | [noun sg] over a [adv] long period | 6 |