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Merry Tales is a short volume with sketches by Mark Twain , published by Webster in 1892 , Contents : - THE PRIVATE HISTORY OF A CAMPAIGN THAT FAILED - THE INVALIDS STORY - LUCK - THE CAPTAINS STORY - A CURIOUS EXPERIENCE - MRS. Mc WILLIAMS AND THE LIGHTNING - MEISTERSCHAFT References
 Mark Twain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mark Twain