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• [1] http://en.wiktionary.org/wiki/lead#Etymology_2
• [2] http://dictionary.reference.com/browse/lead
• [3] http://www.etymonline.com/index.php?term=lead
• [4] http://www.merriam-webster.com/dictionary/lead
• [5] http://www.etymonline.com/index.php?search=duct&searchmode=none and http://www.etymonline.com/index.php?search=conduct&searchmode=none

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