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The CK-12 Foundation is a California-based non-profit organization striving to reduce the cost of , and increase access to , K-12 education in the United States and worldwide .
 CK-12 Foundation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 CK-12 Foundation