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  1. comps = ["PC", "MAC", "PC", "PC", "LINUX", "MAC", "DIDAKTIK"]
  2.  
  3. duplicities = comps.group_by{|x| x.first}.find_all{|k,v| v.size > 1}.map{|x| x.first}
  4.  
  5. duplicities # => ["MAC","PC"]
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