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Cleves and Marck were reunited again 4 years later , when Dietrich died and was succeeded by Adolph IV .
 Cleves, Marck, Dietrich, Adolph
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cleves, Marck, Dietrich, Adolph