subtracting 2's

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Cards

3-2= 1  
4-2= 2  
5-2= 3  
6-2= 4  
7-2= 5  
8-2= 6  
9-2= 7  
10-2= 8  
11-2= 9  
12-2= 10  

Quisition is a browser-based flashcard system that repeats old cards and introduces new ones at optimal time intervals. You can create your own card packs or use those developed by others.