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Beautiful , difficult , quirky , but never flashy for the sake of show , Kottke 's singular style remains vital and influential to everyone who picks up an acoustic guitar ... this is as good a place as any to start a Kottke collection . "
 Kottke, Kottke
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kottke, Kottke