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The 15 cm sIG 33 ( Sf ) auf Panzerkampfwagen I Ausf B ( sometimes referred to as the Sturmpanzer I Bison ) was a German self-propelled heavy infantry gun used during World War II .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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