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At the famous Schola Medica Salernitana , he learns from a doctor that the cure does exist , though it is not available for Heinrich : only the life blood of a virgin of marriageable age , who freely sacrifices herself can cure him .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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