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The protagonist remembers once hearing friendly shouts of "Hi, Joe," but this time is greeted with calls of "coco," a slur referring to a biological weapon – coccobacillus – that Americans were rumored to have used in the war against North Korea.

The protagonist remembers once hearing friendly shouts of “Hi, Joe,” but this time is greeted with calls of “coco,” a slur referring to a biological weapon — coccobacillus — that Americans were rumored to have used in the war against North Korea.