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Primary, Secondary, Tertiary, and Quaternary in Organic Chemistry
http://www.masterorganicchemistry.com/2010/06/16/1%C2%B0-2%C2%B0-3%C2%B0-4%C2%B0/
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Primary, Secondary, Tertiary, and Quaternary in Organic Chemistry
http://www.masterorganicchemistry.com/2010/06/16/1%C2%B0-2%C2%B0-3%C2%B0-4%C2%B0/