[ EFraction
    NormalFrac
    (EGrouped [ EIdentifier "x" , ESpace (7 % 20) , EIdentifier "y" ])
    (ENumber "2")
, ESymbol Bin "+"
, EFraction
    NormalFrac
    (ENumber "2")
    (EGrouped [ EIdentifier "x" , ESpace (0 % 1) , EIdentifier "y" ])
, ESymbol Bin "+"
, EFraction
    NormalFrac
    (EGrouped [ EIdentifier "x" , ESpace (0 % 1) , EIdentifier "y" ])
    (ENumber "2")
]