No | Pattern | Freq | Relations |
---|---|---|---|
1 | [prep] a long period of time | 88 | |
2 | [prep] a long period of time | 88 | |
3 | over a long period of time | 71 | |
4 | over a long period of time | 71 | |
5 | for a long period of time | 14 | |
6 | for a long period of time | 14 |
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