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Activities SFF publishes the journal Foundation : The International Review of Science Fiction three times a year and occasional critical works under the general title Foundation Studies in Science Fiction .
 Foundation, Science Fiction, Foundation, Science Fiction
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Foundation, Science Fiction, Foundation, Science Fiction