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William and Gayle Cook , billionaire philanthropists , made a large donation of approximately $ 1,200,000.00 in 2007 to begin the restoration process .
 William, Gayle Cook
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:
 William, Gayle Cook