No | Pattern | Freq | Relations |
---|---|---|---|
1 | a long period [prep] | 216 | |
2 | a long period [prep] | 216 | |
3 | a long period [prep] | 216 | |
4 | a long period of | 183 | |
5 | a long period of | 183 | |
6 | a long period in | 7 | |
7 | a long period in | 7 | |
8 | a long period during | 6 | |
9 | a long period during | 6 |