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However , since both composers had died by the time of the sonatas ' first publication , the publishers changed the dedication to Robert Schumann , who was still active at the time .
 person: Robert Schumann
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: Robert Schumann