No | Pattern | Freq | Relations |
---|---|---|---|
1 | [prep] [noun pl] [prep] a period [prep] | 29 | |
2 | [prep] [noun pl] [prep] a period of | 26 | |
3 | [prep] [noun pl] over a period [prep] | 17 | |
4 | [prep] [noun pl] over a period [prep] | 17 | |
5 | of [noun pl] [prep] a period [prep] | 10 | |
6 | by [noun pl] [prep] a period [prep] | 5 | |
7 | [prep] [noun pl] for a period [prep] | 5 | |
8 | [prep] [noun pl] for a period [prep] | 5 |