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In 1837 , he entered the University of Halle and joined the Arnold Ruge 's intellectual circle , the Young Hegelians .
 University of Halle, Arnold Ruge
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 University of Halle, Arnold Ruge