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John was the son of William de Warenne , 5th Earl of Surrey and Maud Marshal .
 William de Warenne , 5th Earl of Surrey, Maud Marshal
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William de Warenne , 5th Earl of Surrey, Maud Marshal