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Date: Thu, 15 May 2014 08:39:56 -0700 (PDT)
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Subject: Re: Air Traffic Control Issue
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Date: 2014-05-15T08:39:56-07:00
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Look here: http://www.iaeng.org/publication/IMECS2009/IMECS2009_pp1095-1099.pdf

It seems that both Jovial and Assembly Language were mostly used.