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In the timeline of the Greek history of thought , some thinkers conceptualized a single world ( Plato , Aristotle , Anaxagoras and Archelaus ) , while others instead speculated on the existence of a series of worlds , continuous or non-continuous ( Anaximenes , Heraclitus , Empedocles and Diogenes ) .
 Plato, Aristotle, Anaxagoras, Archelaus, Anaximenes, Heraclitus, Empedocles, Diogenes
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, Aristotle, Anaxagoras, Archelaus, Anaximenes, Heraclitus, Empedocles, Diogenes