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The flatness and horizon problems are naturally solved in the Einstein-Cartan-Sciama-Kibble theory of gravity , without needing an exotic form of matter or free parameters .
 Einstein-Cartan-Sciama-Kibble
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Einstein-Cartan-Sciama-Kibble