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Legal philosopher and theorist John Henry Wigmore produced maps of legal arguments using numbered premises in the early 20th century , based in part on the ideas of 19th century philosopher Henry Sidgwick who used lines to indicate relations between terms .
 John Henry Wigmore, Henry Sidgwick
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:
 John Henry Wigmore, Henry Sidgwick