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The opera centres on the love affair of Horatio Nelson , 1st Viscount Nelson and Emma , Lady Hamilton .
 Horatio Nelson , 1st Viscount Nelson, Emma , Lady Hamilton
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Horatio Nelson , 1st Viscount Nelson, Emma , Lady Hamilton