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http://www.ecfr.gov/cgi-bin/retrieveECFR?SID=bad23c28ebd662323b3ace1e3f5ee94f&gp=&mc=true&n=pt21.2.101&r=PART&source=govdelivery&ty=HTML+-+se21.2.101_165&utm_medium=email&utm_source=govdelivery