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In 1728 , she rediscovered sets of sketches by Leonardo da Vinci and Hans Holbein that had been hidden in a drawer since the reign of William III .
 Leonardo da Vinci, Hans Holbein, William III
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Leonardo da Vinci, Hans Holbein, William III