<<< native [ EIdentifier "x" , ESymbol Bin "+" , EIdentifier "x" , ESymbol Bin "+" , EIdentifier "x" , ESymbol Bin "+" , EIdentifier "x" , ESymbol Bin "+" , EIdentifier "x" , ESymbol Bin "+" , EIdentifier "x" ] >>> tex x + x + x + x + x + x