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In Plato 's interpretation of Anaximenes 's theory , he considers the seven states of matter : fire , air , wind , clouds , earth and stone as different densities .
 Plato, Anaximenes
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, Anaximenes