<<< native [ EUnderover False (EUnderover False (EIdentifier "BASE") (EIdentifier "first under script") (EIdentifier "second overscript")) (EIdentifier "second one") (EIdentifier "first overscript") , ESymbol Rel "=" , EUnderover False (EOver False (EUnder False (EIdentifier "BASE") (EIdentifier "first under script")) (EIdentifier "second overscript")) (EIdentifier "second one") (EIdentifier "first overscript") ] >>> tex \underset{second\ one}{\overset{first\ overscript}{\underset{first\ under\ script}{\overset{second\ overscript}{BASE}}}} = \underset{second\ one}{\overset{first\ overscript}{\overset{second\ overscript}{\underset{first\ under\ script}{BASE}}}}