With no explanation, label each line with "O", "organization-company", "organization-media/newspaper", "person-artist/author", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
The
show
's
origins
and
format
trace
back
to
``
Sneak
Previews
``
(
1975
)
,
a
PBS
series
produced
by
WTTW
that
originally
featured
Roger
Ebert
and
Gene
Siskel
,
and
``
At
the
Movies
``
,
a
follow-up
show
that
the
two
critics
created
with
Tribune
Entertainment
.
The:O
show:O
's:O
origins:O
and:O
format:O
trace:O
back:O
to:O
``:O
Sneak:art-broadcastprogram
Previews:art-broadcastprogram
``:O
(:O
1975:O
):O
,:O
a:O
PBS:organization-media/newspaper
series:O
produced:O
by:O
WTTW:organization-media/newspaper
that:O
originally:O
featured:O
Roger:person-artist/author
Ebert:person-artist/author
and:O
Gene:person-artist/author
Siskel:person-artist/author
,:O
and:O
``:O
At:art-broadcastprogram
the:art-broadcastprogram
Movies:art-broadcastprogram
``:O
,:O
a:O
follow-up:O
show:O
that:O
the:O
two:O
critics:O
created:O
with:O
Tribune:organization-company
Entertainment:organization-company
.:O