LaTeXで箇条書きの記号を変える

\documentclass[a5paper]{jsarticle}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage[utf8]{inputenc}
\usepackage{amsmath,amssymb}
\usepackage{inconsolata}
\usepackage{okumacro}
\begin{document}

\renewcommand{\labelitemi}{$\star$}
\renewcommand{\labelitemii}{$\circ$}
\renewcommand{\labelitemiii}{$\triangleright$}
\renewcommand{\labelitemiv}{$\diamond$}

\begin{itemize}
\item あいうえお
\begin{itemize}
\item カキクケコ
\begin{itemize}
\item さしすせそ
\end{itemize}
\end{itemize}
\item あいうえお
\item あいうえお
\end{itemize}

\end{document}