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In more abstract language , there is a Galois connection , giving rise to two closure operators ; they can be identified , and naturally play a basic role in the theory ; the example is elaborated at Galois connection .
 person: Galois; person: Galois
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: Galois; person: Galois