hankel.tex

\documentclass[a4paper]{article}
\usepackage[utf8]{inputenc}

\usepackage{default}
\usepackage[margin=1.5cm]{geometry}
\usepackage{commath, amsmath, amssymb}
\usepackage{breqn}

\begin{document}
$$
\input{sample_hankel.tex}
$$
\section{Short story}
\input{payload_short}
\section{Long story}
\input{payload_long}
\end{document}