From: salemkern3@yahoo.com   
      
   I have list of people, each of whom has picked 20   
   musical groups as their favorites. I would like   
   to find clusters among the musical groups: for example,   
   if people who enjoy group A also enjoy group B, but don't   
   enjoy group C, then A and B should be clustered together   
   and C should be in a different cluster.   
      
   I seem to remember some algorithm that would perform this   
   clustering (collaborative filtering, naive bayes?).   
      
   What algorithm am I looking for?   
      
   Thanks,   
   Salem   
      
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