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In fact , the converse is also true ; being a Tychonoff space is both necessary and sufficient for possessing a Hausdorff compactification .
 Tychonoff, Hausdorff
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tychonoff, Hausdorff