What is the difference between the two following structures? – tex.stackexchange.com

First: \def\cs#1#2{00\fi\def\csa{#1}\def\csb{#2} \ifx\csa\csb} \if\cs{...}{...} Second: \def\cs#1#2{\fi\def\csa{#1}\def\csb{#2} \ifx\csa\csb} \if\cs{...}{...} I mean what role does 00 play in this ...

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