<<< native [ EUnder False (EIdentifier "x") (ESymbol Accent "\8411") , ESymbol Rel "\8800" , EUnder False (EIdentifier "x") (ESymbol Accent "\8411") , ESymbol Rel "=" , EUnder False (EIdentifier "x") (ESymbol Accent "\8411") , ESymbol Rel "=" , EUnder False (EIdentifier "x") (ESymbol Accent "\8411") ] >>> tex \underset{\dddot{}}{x} \neq \underset{\dddot{}}{x} = \underset{\dddot{}}{x} = \underset{\dddot{}}{x}