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and by Paul Ekman , who defines lies by omission as the main form of lying " & ndash ; though larger and more complex moral and ethical issues of lying and truth-telling extend far beyond these specific doctrines .
 Paul Ekman
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:
 Paul Ekman