Referring to same footnote multiple times inside tabular

Question

I have a document with a list of tabular items. Some of the rows of the tables might need to refer to the same footnote, and there can be multiple such footnotes.

The following is an MCVE:

\documentclass{article}

\usepackage{enumitem}
\usepackage{multicol}

\newcommand{\mystart}{\begin{enumerate}[leftmargin=*,label={[\arabic*]}]}
\newcommand{\myend}{\end{enumerate}}
\newcommand{\myitem}[2]{
    \vspace{-5pt}\item \begin{tabular*}{0.95\textwidth}[t]{l@{\extracolsep{\fill}}r}
        \multicolumn{1}{p{10cm}}{\small{#1}} & \small{#2}
    \end{tabular*}\vspace{-10pt}
}

\begin{document}
    \mystart
        \myitem{A\footnotemark, B\footnotemark}{P}\footnotetext{F1}
        \myitem{C\footnotemark, D\footnotemark}{Q}\footnotetext{F2}
    \myend
\end{document}

The output is

with the footnotes at the bottom of the page as

However, I would like the following to happen instead:

1. Footnotes should not be numbered.
2. A and B should point to the same footnote, and C and D should point to the same footnote.
3. All footnotes should appear at the bottom of the same page.

Earlier, I did not need this inside a tabular, and for that, this answer worked well. But inside a tabular, the footnote marks appear but no footnote appears anywhere in the document.

I also tried suggestions from a few other answers to use footref, such as this, but that did not work.

How can I do this? Thank you.

Answer 1

You can pass an optional argument to \footnotemark[<value>] and \footnotetext[<value>]{<text>} that sets the <value> to be displayed. Additionally, redefining the footnote counter representation to use \roman removes it from being set if you pass a <value> of 0:

\documentclass{article}

\usepackage{tabularx}

\newcounter{mycount}

\newcommand{\mystart}{%
  \par\medskip
  \setcounter{mycount}{0}}
\newcommand{\myend}{%
  \par\medskip}

\newcommand{\myitem}[2]{%
  \par
  \noindent
  \stepcounter{mycount}%
  \begin{tabularx}{\linewidth}{ @{} X r @{} }
    [\themycount]\ \small #1 & \small #2
  \end{tabularx}
}

\begin{document}

\mystart
  \myitem{\stepcounter{footnote}A\footnotemark[\value{footnote}], B\footnotemark[\value{footnote}]}
    {P}{\renewcommand{\thefootnote}{\roman{footnote}}\footnotetext[0]{F1}}
  \myitem{\stepcounter{footnote}C\footnotemark[\value{footnote}], D\footnotemark[\value{footnote}]}
    {Q}{\renewcommand{\thefootnote}{\roman{footnote}}\footnotetext[0]{F2}}
\myend

\end{document}