Selectively including or excluding slides

The commands
$\begin{MD} \onlyslides{list}\\ \notslides{list} \end{MD}$
can be used to include or exclude only those slides in the given list. The argument should expand to a comma-separated list of numbers or ranges. The numbers do not need to be in order, the list can contain numbers that do not correspond to any slide, and there can be duplicate numbers. Negative numbers should be enclosed in curly braces. Since the argument is first expanded, you can use the "#_#>SPMquot; command in the argument. For example,

  \onlyslides{{-2},\ref{dp}-10,\ref{chart},0,17-999}

is legal. If "" appears in slide 5 and "" appears in slide 12, this is equivalent to:

  \onlyslides{{-2},5-10,12,0,17-999}