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On April 12 , 2012 , Melvin Knight of Greensburg , Pennsylvania pleaded guilty to first - and second-degree murder , kidnapping , and conspiracy to commit murder and kidnapping .
 Greensburg , Pennsylvania
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Greensburg , Pennsylvania