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 ":".
In
2001
,
it
saw
2
terrorist
attacks
resulting
over
20
deaths
and
10
injuries
.
In:O
2001:O
,:O
it:O
saw:O
2:O
terrorist:O
attacks:O
resulting:O
over:O
20:O
deaths:O
and:O
10:O
injuries:O
.:O