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The 42nd Walker Cup Match was held September 12-13 , 2009 at the Merion Golf Club ( East course ) in Ardmore , Pennsylvania , United States .
 Merion Golf Club, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Merion Golf Club, United States