53512
Most of the time , these results hold for all preregular spaces ; they were listed for regular and Hausdorff spaces separately because the idea of preregular spaces came later .
 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:
 Hausdorff