No | Pattern | Freq | Relations |
---|---|---|---|
1 | or [prep] a [adj] period | 13 | |
2 | or [prep] a [adj] period | 13 | |
3 | or [prep] a [adj] period | 13 | |
4 | or [prep] a [adj] period | 10 | |
5 | or over a [adj] period | 6 | |
6 | or [prep] a long period | 6 | |
7 | or over a [adj] period | 6 |