No | Pattern | Freq | Relations |
---|---|---|---|
1 | over a long period [prep] | 93 | |
2 | over a long period [prep] | 93 | |
3 | over a long period [prep] | 85 | |
4 | over a long period of | 84 | |
5 | over a long period of | 84 | |
6 | over a longer period [prep] | 8 |
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