No | Pattern | Freq | Relations |
---|---|---|---|
1 | be [vb pp] over a long period | 22 | |
2 | be [verb] over a long period | 14 | |
3 | be [verb] over a long period | 10 | |
4 | be [verb] over a longer period | 8 | |
5 | been [verb] over a long period | 5 |
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