191362
He did not tell Lewis of his objections to Barker 's work and there is no record that there was any correspondence between Frost and Barker .
 Lewis, Barker, Frost, Barker
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lewis, Barker, Frost, Barker