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[verb] over a period of

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No Pattern Freq Relations
1 [vb past] over a period of 19                    
2 [v-ing] over a period of 12                    
3 [vb -s] over a period of 8                    
4 [to-vb] over a period of 6                    
5 [vb base] over a period of 6                    
6 occur over a period of 5                    
7 extend over a period of 5                    
8 [vb infin] over a period of 5                    
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