How to replace content over previous material in Beamer?

Question

I am making a list in beamer that I want replaced on the same slide with another list using the \itemize command. I am using \uncover so that the listed items show up one-by-one. Once the first list is finished, I want it to disappear and then be replaced by the new list. My problem is that the new list appears below where the first list would have. Here is my code:

\documentclass[24pt]{beamer}

\usepackage{amssymb,amscd,amsthm,amsmath,graphicx,color}
\usepackage{booktabs}
\usepackage{color}
\usepackage[color,matrix,arrow]{xy}
%\usepackage{ragged2e}
\usepackage[scale=2]{ccicons}
\usepackage{multicol}

\begin{document}

\begin{frame}

    \begin{itemize}
    \uncover<1-4>{\item (CONTENT 1)}

    \uncover<2-4>{\item (CONTENT 2)}

    \uncover<3-4>{\item (CONTENT 3)}
    \end{itemize}

    \begin{itemize}
    \uncover<6->{\item (CONTENT A)}

    \uncover<7->{\item (CONTENT B)}

    \uncover<8->{\item (CONTENT C)}
    \end{itemize}

\end{frame}

\end{document}  

Answer 1

To exchange content, you can use \alt<...>{...}{...}

\documentclass[24pt]{beamer}

\usepackage{amssymb,amscd,amsthm,amsmath}
\usepackage{booktabs}
\usepackage[color,matrix,arrow]{xy}
%\usepackage{ragged2e}
\usepackage[scale=2]{ccicons}

\begin{document}

\begin{frame}

\alt<1-4>{
    \begin{itemize}
    \uncover<1-4>{\item (CONTENT 1)}

    \uncover<2-4>{\item (CONTENT 2)}

    \uncover<3-4>{\item (CONTENT 3)}
    \end{itemize}
}{
    \begin{itemize}
    \uncover<6->{\item (CONTENT A)}

    \uncover<7->{\item (CONTENT B)}

    \uncover<8->{\item (CONTENT C)}
    \end{itemize}
}
\pause[8]
\end{frame}

\end{document}