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The 45 mm anti-aircraft gun ( 21-K ) was a Soviet design adapted from the 45 mm anti-tank gun M1937 ( 53-K ) .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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