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The concepts were highly influential , and his own contribution lives on in the names of the Hilbert class field and of the Hilbert symbol of local class field theory .
 person: Hilbert; person: Hilbert
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Hilbert; person: Hilbert