No | Pattern | Freq | Relations |
---|---|---|---|
1 | [prep] a fixed period [prep] | 29 | |
2 | [prep] a fixed period [prep] | 29 | |
3 | [prep] a fixed period [prep] | 29 | |
4 | [prep] a fixed period of | 25 | |
5 | [prep] a fixed period of | 25 | |
6 | for a fixed period [prep] | 18 | |
7 | for a fixed period [prep] | 18 |