list 1 of the stems

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Cards

ante before  
anti against  
bi two  
circum around  
com together  
con together  
de down  
dis away  
equi equal  
extra beyond  
inter between  
intra within  
intro into  
mal bad  
mis bad  
non not  
post after  
pre before  
semi half  
sub under  
super over  
syn together  
sym together  
tri three  
un not  

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.