About using dash line in markdown file

[user107 <s794115478-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I'm using LaTeX in a markdown file, and I try to use dash line in a martix, 
but it seems pandoc 3.1.9 can not recognize `:` and `\hdashline`

the Pandoc command is like this: `pandoc --mathml test.md -o test.html`

and the LaTeX code is:

$$
\begin{array}{c|ccc:c}
X/Y & -1    & 0     & 1     &       \\ \hline
-1  & 0.125 & 0.125 & 0.125 & 0.375 \\
0   & 0.125 & 0     & 0.125 & 0.25  \\
1   & 0.125 & 0.125 & 0.125 & 0.375 \\ \hdashline
    & 0.375 & 0.25  & 0.375 & \rho_{XY}
\end{array}
$$

and the error is:

```
  unexpected ":"
  expecting letter, "|", "*", white space or "}"
  
  unexpected control sequence \hdashline
  expecting "%", "\\label", "\\tag", "\\nonumber", whitespace or 
"\\allowbreak"
```
my expected output is:

[image: screenshot145728.jpg]

what can I do to fix that?

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