With no explanation, label each line with "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Uranus
and
Neptune
(
known
as
the
``
ice
giants
''
)
exist
in
a
region
where
the
reduced
density
of
the
solar
nebula
and
longer
orbital
times
render
their
formation
highly
implausible
.
Uranus:other-astronomything
and:O
Neptune:other-astronomything
(:O
known:O
as:O
the:O
``:O
ice:O
giants:O
'':O
):O
exist:O
in:O
a:O
region:O
where:O
the:O
reduced:O
density:O
of:O
the:O
solar:O
nebula:O
and:O
longer:O
orbital:O
times:O
render:O
their:O
formation:O
highly:O
implausible:O
.:O