规则是，\item[$所需形状$]
\begin{itemize}
\item[$\ast$]
\item[$\diamond$]
\item[$\circ$]
\item[$\cdot$]
\item[$\bullet$]
\item[--]
\item[$-$]
\item[$\blacklozenge$]
\item[$\bigstar$]
\item[$\blacktriangle$]
\item[$\blacksquare$]
\item[$\square$]
\end{itemize}
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