如何用 A1、B1、C1 进行枚举

Question

如何使用枚举包来枚举 A1、B1、C1 和 A2、B2、C2。

Answer 1

\documentclass{article}
\usepackage{enumitem}
\newcounter{Ax}
\newcounter{Bx}

\newcommand{\itemA}{%
    \addtocounter{Ax}{1}
    \item[A\theAx.]}
\newcommand{\itemB}{%
    \addtocounter{Bx}{1}
    \item[B\theBx.]}

\begin{document}
    \noindent \textbf{Case I}
    \begin{enumerate}
        \itemA Series A
        \itemB Series B
        \itemA Series A
        \itemB Series B
        \itemB Series B
        \itemB Series B
        \itemA Series A
    \end{enumerate}

    \noindent \textbf{Case II}
    \begin{enumerate}[label=A\arabic*.,  series=A]
        \item First item
    \end{enumerate}
    \begin{enumerate}[label=B\arabic*.,  series=B]
        \item Second item
    \end{enumerate}
    \begin{enumerate}[resume*=A]
        \item Third item
    \end{enumerate}
    \begin{enumerate}[resume*=B]
        \item Fourth item
    \end{enumerate}
\end{document}