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She was a keynote speaker at the September 22 , 2006 National Council of Teachers of Mathematics convention .
 organization: National Council of Teachers of Mathematics
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: National Council of Teachers of Mathematics 
Answer:
 organization: National Council of Teachers of Mathematics