<<< native
[ EGrouped
    [ ENumber "5"
    , ESymbol Bin "+"
    , ENumber "3"
    , ESymbol Bin "+"
    , ENumber "12.3"
    , ESymbol Bin "+"
    , ENumber "10000"
    , ESymbol Bin "+"
    , ENumber "0.01"
    , ESymbol Bin "+"
    , ENumber "2"
    ]
, EGrouped
    [ ENumber "5"
    , ESymbol Bin "+"
    , ENumber "3"
    , ESymbol Bin "+"
    , ENumber "12.3"
    , ESymbol Bin "+"
    , ENumber "10000"
    , ESymbol Bin "+"
    , ENumber "0.01"
    , ESymbol Bin "+"
    , ENumber "2"
    ]
]
>>> eqn
{5 + 3 + 12.3 + 10000 + 0.01 + 2} {5 + 3 + 12.3 + 10000 + 0.01 + 2}