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Aubrey de Vere , 20th Earl of Oxford KG PC ( 28 February 1627 – 12 March 1703 ) was the son of Robert de Vere , 19th Earl of Oxford and his wife Beatrix van Hemmend .
 Aubrey, Vere, 20th Earl, Oxford, Robert de Vere , 19th Earl of Oxford
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Aubrey, Vere, 20th Earl, Oxford, Robert de Vere , 19th Earl of Oxford