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Huub and Adelheid Kortekaas present themselves as artists duo since 1999 , although they actually have worked together since their marriage in 1969 .
 Huub, Kortekaas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Huub, Kortekaas