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Professional In 1980 , Freitag signed with the San Diego Sockers of the North American Soccer League , but played no first team games .
 Freitag, San Diego Sockers, North American Soccer League
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Freitag, San Diego Sockers, North American Soccer League