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A few tunes were cut with strings in order to bring out the essential ballad character of the songs ( with the help of Bob Mersey 's skillful arranging ) ; most of the tracks , though , were made with the assistance of a small and sympathetic accompanying group for which Mersey supplied minimal written guidance .
 None
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:  
Answer:
 None