No | Pattern | Freq | Relations |
---|---|---|---|
1 | a long period [prep] | 245 | |
2 | a long period [prep] | 245 | |
3 | a long period [prep] | 216 | |
4 | a long period of | 205 | |
5 | a long period of | 205 | |
6 | a longer period [prep] | 29 | |
7 | a long period in | 9 | |
8 | a long period in | 9 | |
9 | a long period during | 8 | |
10 | a long period during | 8 |