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G. Washington Childs , sometimes called " The Laureate of Grief " , was another well known exponent ; he was one of the chief authors of the verse appearing in the Philadelphia Public Ledger that was noticed by Twain .
 person: G. Washington Childs; organization: Philadelphia Public Ledger; person: Twain
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: G. Washington Childs, Philadelphia Public Ledger, Twain 
Answer:
 person: G. Washington Childs; organization: Philadelphia Public Ledger; person: Twain