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 ":".
On
6
September
1914
was
the
very
first
air-sea
battle
in
history
.
On:O
6:O
September:O
1914:O
was:O
the:O
very:O
first:O
air-sea:O
battle:O
in:O
history:O
.:O