No | Pattern | Freq | Relations |
---|---|---|---|
1 | [prep] a [adj] period [prep] | 773 | |
2 | [prep] a certain [noun] [prep] | 676 | |
3 | [prep] a certain [noun sg] [prep] | 675 | |
4 | [prep] [art] certain period [prep] | 22 | |
5 | [prep] [art] certain period [prep] | 22 | |
6 | [prep] a certain period [prep] | 22 | |
7 | [prep] a certain period [prep] | 22 |