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The early strips were written by Leslie Charteris , who had previous experience writing comic strips , having replaced Dashiell Hammett as the writer of the " Secret Agent X-9 " strip .
 Leslie Charteris, Dashiell Hammett
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leslie Charteris, Dashiell Hammett