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Robert James ( 1703 – 23 March 1776 ) was an English physician who is best known as the author of A Medicinal Dictionary , as the inventor of a popular " fever powder " , and as a friend of Samuel Johnson .
 Samuel Johnson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Samuel Johnson