#one {}
#one#two {}

#one #two {}
#one#two #three#four {}


div#one#two {}
div#one.two {}
div.one#two {}
div #one {}
div #one#two {}

#one#two#three#four#five#six#seven#eight#nine#ten#eleven#twelve#thirteen#fourteen#fifteen#sixteen#seventeen#eighteen#nineteen#twenty {}

#one, #two {}
#one#two, #three#four {}
#one #two#three, #four {}