How do I add a second section name to this logic? I need to add a second section name to this code:

craft.entries.section('not homePage')


I can't figure out the correct formatting. I've tried:

craft.entries.section('not homePage,clientPage')
craft.entries.section('not homePage, not clientPage')﻿


How do I add a second limiter?
A second limiter is added to the conditional like this:

craft.entries.section('and, not homepage, not clientPage')