<<< native [ EOver False (EIdentifier "BASE") (EIdentifier "over script") , ESymbol Rel "=" , EOver False (EOver False (EOver False (EIdentifier "BASE") (EIdentifier "over script")) (EPhantom (EIdentifier "over"))) (EPhantom (EIdentifier "over")) ] >>> mml $$\stackrel{\mathrm{over\; script}}{\mathrm{BASE}}=\stackrel{\phantom{\mathrm{over}}}{\stackrel{\phantom{\mathrm{over}}}{\stackrel{\mathrm{over\; script}}{\mathrm{BASE}}}}$$