<<< native
[ EFraction NormalFrac (ENumber "1") (ENumber "2")
, ESymbol Bin "+"
, EFraction NormalFrac (ENumber "1") (ENumber "2")
, ESymbol Bin "+"
, EFraction
    NormalFrac
    (ENumber "1")
    (EGrouped
       [ ENumber "1"
       , ESymbol Bin "+"
       , EFraction NormalFrac (EIdentifier "x") (ENumber "3")
       ])
, ESymbol Bin "+"
, EFraction
    NormalFrac
    (ENumber "1")
    (EGrouped
       [ ENumber "1"
       , ESymbol Bin "+"
       , EFraction NormalFrac (EIdentifier "x") (ENumber "3")
       ])
, ESymbol Bin "+"
, EFraction
    NormalFrac
    (ENumber "1")
    (EGrouped
       [ ENumber "1"
       , ESymbol Bin "+"
       , EFraction NormalFrac (EIdentifier "x") (ENumber "3")
       ])
]
>>> tex
\frac{1}{2} + \frac{1}{2} + \frac{1}{1 + \frac{x}{3}} + \frac{1}{1 + \frac{x}{3}} + \frac{1}{1 + \frac{x}{3}}