$l2h_cache_key = q/$$ 2 a = \dot{\phi} $$/; $l2h_cache{$l2h_cache_key} = q|

\begin{displaymath}
2 a = \dot{\phi}
\end{displaymath}

|; $l2h_cache_key = q/From @ someone <> ! $$ a = \phi $$/; $l2h_cache{$l2h_cache_key} = q|From @ someone <> !

\begin{displaymath}
a = \phi
\end{displaymath}

|; 1;