[ 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"
]