<<< native [ ESuper (ENumber "2") (ESuper (ENumber "3") (ENumber "4")) , ESymbol Rel "=" , ESuper (ENumber "2") (ESuper (ENumber "3") (EOver False (ENumber "4") (EPhantom (ENumber "5")))) ] >>> eqn 2 sup {3 sup 4} = 2 sup {3 sup {4 to {hphantom 5}}}