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The root meaning of the word " postulate " is to " demand " ; for instance , Euclid demands that one agree that some things can be done ( e.g. , any two points can be joined by a straight line ) .
 Euclid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Euclid