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 ":".
2
AOS
was
closed
on
July
14
,
1944
.
2:O
AOS:O
was:O
closed:O
on:O
July:O
14:O
,:O
1944:O
.:O