[EGrouped [ESubsup (EIdentifier "S") (EGrouped [ESubsup (EIdentifier "Q") (ENumber "4") (ENumber "3")]) (EGrouped [ESubsup (EIdentifier "P") (ENumber "2") (ENumber "1")]),ESymbol Op "=",ESubsup (EIdentifier "S") (EGrouped [ESubsup (EIdentifier "Q") (EGrouped [ENumber "4",EUnary "\\phantom" (EGrouped [EText TextNormal "z"])]) (ENumber "3")]) (EGrouped [ESubsup (EIdentifier "P") (ENumber "2") (EGrouped [ENumber "1",EUnary "\\phantom" (EGrouped [EText TextNormal "z"])])])]]