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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 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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