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He is usually referred to as Hero Oomkens " the Younger " to distinguish him from his maternal grandfather , Hero Oomkens the Elder .
 Hero Oomkens, Hero Oomkens
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hero Oomkens, Hero Oomkens