<<< mml $-x-x-x-x-x-x$ >>> native [ EGrouped [ ESymbol Bin "-" , EIdentifier "x" ] , EGrouped [ ESymbol Bin "-" , EIdentifier "x" ] , EGrouped [ ESymbol Bin "-" , EIdentifier "x" ] , EGrouped [ ESymbol Bin "-" , EIdentifier "x" ] , ESymbol Bin "-" , EIdentifier "x" , ESymbol Bin "-" , EIdentifier "x" ]