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Leo Buscaglia encourages people to hug for 21 days consecutively and to have each day a hug that lasts for a minimum of 21 seconds .
 Leo Buscaglia
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:
 Leo Buscaglia