80140
As a humorous tribute to Carl Sagan and his association with the catchphrase " billions and billions " , a " sagan " has been defined as a large quantity – technically at least four billion ( two billion plus two billion ) – of anything .
 Carl Sagan
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:
 Carl Sagan