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Following Sierra 's buyout by Havas Interactive and disappointing sales of its last titles , Coktel Vision is now developing only educational games that are marketed mostly in Europe .
 Sierra, Coktel Vision
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sierra, Coktel Vision