No | Pattern | Freq | Relations |
---|---|---|---|
1 | over a long period of [noun sg] | 78 | |
2 | over a long period of [noun sg] | 78 | |
3 | over [art] long period of [noun sg] | 78 | |
4 | over [art] long period of time | 77 | |
5 | over [art] long period of [noun sg] | 72 | |
6 | over [art] longer period of [noun sg] | 6 |