How do I use the CSS Grouping selector for several children

I want to set the style of
a, a:hover, a:visitied
and
a:active
, in the nav section of my site separately from the rest of the site. I thought I'd use a CSS selector of
nav a, a:hover
, but this selects
nav a
and
a:hover
not
nav (a and a:hover)
. Is there a ... brackets for this, like for math?
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