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 ":".
The
nature
of
the
infrared
spectrum
and
the
x-ray
emission
is
interpreted
as
a
binary
system
containing
a
Wolf-Rayet
(
WR
)
star
and
a
compact
object
.
The:O
nature:O
of:O
the:O
infrared:O
spectrum:O
and:O
the:O
x-ray:O
emission:O
is:O
interpreted:O
as:O
a:O
binary:O
system:O
containing:O
a:O
Wolf-Rayet:other-astronomything
(:other-astronomything
WR:other-astronomything
):other-astronomything
star:other-astronomything
and:O
a:O
compact:O
object:O
.:O