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The M7 grenade launcher , formally Rifle Grenade Launcher , M7 was a 22 mm rifle grenade launcher attachment for the M1 Garand rifle which saw widespread use throughout World War II and the Korean War .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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