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The vicious circle principle was suggested by Henri Poincaré ( 1905 - 6 , 1908 ) and Bertrand Russell in the wake of the paradoxes as a requirement on legitimate set specifications .
 Henri Poincaré, Bertrand Russell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Henri Poincaré, Bertrand Russell