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He as well engaged in a debate , as antagonist of Malthusian population theory with proponent Alexander Hill Everett .
 Malthusian, Alexander Hill Everett
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Malthusian, Alexander Hill Everett