<<< native [ ESubsup (EGrouped [ EPhantom (EIdentifier "z") , EIdentifier "S" ]) (EIdentifier "t") (ENumber "7") , ESymbol Rel "=" , ESubsup (EIdentifier "S") (EIdentifier "t") (ENumber "7") ] >>> tex {\phantom{z}S}_{t}^{7} = S_{t}^{7}