<<< native [ EUnderover False (EIdentifier "_ baseline _") (EIdentifier "under script") (EPhantom (EIdentifier "fail")) , ESymbol Rel "=" , EUnder False (EIdentifier "_ baseline _") (EIdentifier "under script") ] >>> tex \underset{under\ script}{\overset{\phantom{fail}}{\_\ baseline\ \_}} = \underset{under\ script}{\_\ baseline\ \_}