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On the night of 20 – 21 July , Captain ( Hauptmann ) Heinrich Prinz zu Sayn-Wittgenstein , commander of IV .
 Heinrich Prinz zu Sayn-Wittgenstein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Heinrich Prinz zu Sayn-Wittgenstein