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Patterns  Collocations 

 (1) over  (2) a  (3) period  (4) 

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No Pattern Freq Relations
1 [noun] over a period 311                    
2 [noun sg] over a period 180                    
3 [noun pl] over a period 109                    
4 [verb] over a period 83                    
5 [vb pp] over a period 78                    
6 [adv] over a period 69                    
7 [adv] over a period 39                    
8 [conj] over a period 29                    
9 [adv prt] over a period 29                    
10 [adj] over a period 29                    
11 [coord] over a period 20                    
12 [adj] over a period 20                    
13 and over a period 14                    
14 and over a period 14                    
15 [noun prp] over a period 12                    
16 place over a period 10                    
17 place over a period 9                    
18 [n mass] over a period 9                    
19 up over a period 9                    
20 up over a period 9                    
21 [pron] over a period 9                    
22 gradually over a period 7                    
23 gradually over a period 7                    
24 out over a period 6                    
25 [that] over a period 6                    
26 that over a period 6                    
27 that over a period 6                    
28 out over a period 6                    
29 made over a period 5                    
30 spread over a period 5                    
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