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He married Mary Clifford , daughter of John Clifford , 7th Baron de Clifford and Lady Elizabeth Percy .
 Clifford, John Clifford , 7th Baron de Clifford, Lady Elizabeth Percy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Clifford, John Clifford , 7th Baron de Clifford, Lady Elizabeth Percy