<<< mml $5+5+1+1+5+3+9$ >>> native [ ENumber "5" , ESymbol Bin "+" , ENumber "5" , ESymbol Bin "+" , ENumber "1" , ESymbol Bin "+" , ENumber "1" , ESymbol Bin "+" , ENumber "5" , ESymbol Bin "+" , ENumber "3" , ESymbol Bin "+" , ENumber "9" ]