With no explanation, label each line with "location-GPE", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Improved
Allied
anti-submarine
warfare
eventually
drove
the
Axis
submarines
out
of
the
Caribbean
region
.
Improved:O
Allied:organization-other
anti-submarine:O
warfare:O
eventually:O
drove:O
the:O
Axis:organization-other
submarines:O
out:O
of:O
the:O
Caribbean:location-GPE
region:O
.:O