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Born in Basel , he began his career in 1922 with FC Basel and stayed with them until 1926 , when he switched to FC Concordia Basel .
 Basel, FC Basel, FC Concordia Basel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Basel, FC Basel, FC Concordia Basel