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The leading 1% code of item [21] (American Mathematical Society, Sample Paper for the amsmath Package, testmath.html): 
\begin{document} 
\maketitle 
\markboth{Sample paper for the {\protect 
\ntt\lowercase{amsmath}} package} 
{Sample paper for the {\protect 
\ntt\lowercase{amsmath}} package} 
\renewcommand{\sectionmark}[1]{} 
 
\section{Introduction} 
 
This paper contains examples of 
various features from \AmS-\LaTeX{}. 
 
\section{Enumeration of Hamiltonian 
paths in a graph}