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The duo was introduced through former band member Zachary Sewall in late 2008 during their freshman year at Drexel University , in Noah 's hometown of Philadelphia , PA. .
 Drexel University
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Drexel University