x
\begin{y}
?
\end{y}
z x
\begin{y}
?
\end{y}
z x \begin{y}?\end{y} z x
\begin{y}?\end{y} z
	x \begin{y}
?\end{y} z
	x \begin{y}?
\end{y} z
	x \begin{y}?\end{y}
z
\begin{foo}[options1]{parameters1}[options2]{parameters2}[options3]{parameters3}[options4]
text...
\end{foo}