With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
The
episode
featured
interviews
with
witnesses
and
accident
investigators
,
and
a
dramatization
of
the
accident
.
The:O
episode:O
featured:O
interviews:O
with:O
witnesses:O
and:O
accident:O
investigators:O
,:O
and:O
a:O
dramatization:O
of:O
the:O
accident:O
.:O