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Specifically , Courcelle 's theorem state that if a graph problem can be expressed in the logic of graphs using monadic second order logic , then it can be solved in linear time on graphs with bounded treewidth .
 Courcelle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Courcelle