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Argon was first isolated from air in 1894 by Lord Rayleigh and Sir William Ramsay at University College London by removing oxygen , carbon dioxide , water , and nitrogen from a sample of clean air .
 Rayleigh, William Ramsay, University College London
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rayleigh, William Ramsay, University College London