With no explanation, label each line with "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
allied
air
fleet
also
made
use
of
AWACS
aircraft
and
Boeing
B-52
Stratofortress
bombers
.
The:O
allied:O
air:O
fleet:O
also:O
made:O
use:O
of:O
AWACS:product-weapon
aircraft:O
and:O
Boeing:product-weapon
B-52:product-weapon
Stratofortress:product-weapon
bombers:O
.:O