\part{this title
will merge}
\chapter{this title
will merge}
\section{this title
will merge}
\subsection{this title
will merge}
\subsubsection{this title
will merge}
\begin{amuseplay}
This will not merge (of course)
\end{amuseplay}
we continue without merging (ugly but valid)
\begin{verse}
Verse will not merge (of course)
\end{verse}
and we continue without merging (ugly but valid)\footnote{the footnote will merge}
\begin{alltt}
nor the example
\end{alltt}
will not merge
\bigskip
\noindent
\begin{minipage}[t]{\textwidth}
\begin{tabularx}{\textwidth}{|X|X|}
\hline
\relax the & table \\
\relax will & merge \\
\hline
\end{tabularx}
\end{minipage}
\bigskip
\begin{center}
but not with a regular
\end{center}
\begin{itemize}
\item\relax
the list
will merge
\begin{enumerate}[a.]
\item\relax
the list
will merge
\end{enumerate}
\end{itemize}
% the comment
will not merge