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Created December 12, 2014 14:25
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ex.tex
\usepackage{xparse}
\ExplSyntaxOn
\cs_new:Npn \dd_parse:nn #1, #2 \q_stop:
{
\frac { \mathrm {d} #1 }
{ \mathrm {d} #2 }
}
\NewDocumentCommand \dd { r[] }
{
\dd_parse:nn #1 \q_stop:
}
\ExplSyntaxOff
% This can be made much more clever with l3clist, but I do not have my reference in front of me.
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untested

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