private static string Short(TableCell actions)
{
string s = string.Empty;
foreach (var action in actions.Distinct())
{
if (action is Reduce reduce)
{
s = $"{s}«{reduce.Production}»";
}
else if (action is Shift shift)
{
s = $"{s}s{shift.State}";
}
else if (action is Accept)
{
s = $"{s}acc";
}
}
return(Short(s));
}