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For example , the unique factorization of the Gaussian integers is convenient in deriving formulae for all Pythagorean triples and in proving Fermat 's theorem on sums of two squares .
 Gaussian, Pythagorean, Fermat
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gaussian, Pythagorean, Fermat