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In the " Timaeus " , Plato 's major cosmological dialogue , the Platonic solid he associated with fire was the tetrahedron which is formed from four triangles and contains the least volume with the greatest surface area .
 Plato, Platonic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Plato, Platonic