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The name of this article was titled , " On a conjecture concerning the Petersen graph " and was published January 19 , 2011 ; The counter-example first starts with a frame graph G that is isomorphic to the Petersen graph minus two edges .
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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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