<<< native [ EFraction NormalFrac (EGrouped [ EIdentifier "x" , ESymbol Bin "+" , EIdentifier "y" , ESymbol Bin "+" , EIdentifier "z" ]) (EGrouped [ EIdentifier "x" , EPhantom (EGrouped [ ESymbol Bin "+" , EIdentifier "y" ]) , ESymbol Bin "+" , EIdentifier "z" ]) ] >>> mml $$\frac{x+y+z}{x\phantom{+y}+z}$$