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This also makes fire the element with the smallest number of sides , and Plato regarded it as appropriate for the heat of fire , which he felt is sharp and stabbing , ( like one of the points of a tetrahedron ) .
 Plato
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