NEWYORK(Reuters)-AvolatiletradingsessionendedwithU.S.stocksmostlyhigheronWednesday,evenasApple,themostvaluablecompanyintheUnitedStates,suffereditsworstdayoflossesinalmostfouryears.Inastrangeoccurrence,AppleaccountedfortheentiretyoftheNasdaq100'sfallof1.1percent,whiletheDowindustrials-whichdonotincludeAppleasacomponent-enjoyedthebestdaysinceNovember28.Withthedrop,Appleshednea...