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Diddel designed the golf course at Northwood Club in Dallas , Texas , which was the site of the 1952 U.S. Open .
 Diddel, Dallas , Texas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Diddel, Dallas , Texas