With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
IN
THE
VERY
HOUR
WHEN
THE
ENEMY
LOOSENED
HIS
LIGHTNING
,
AN
AMERICAN
CORPS
WAS
ATTACKING
THIS
GROUND
.
IN:O
THE:O
VERY:O
HOUR:O
WHEN:O
THE:O
ENEMY:O
LOOSENED:O
HIS:O
LIGHTNING:O
,:O
AN:O
AMERICAN:location-GPE
CORPS:O
WAS:O
ATTACKING:O
THIS:O
GROUND:O
.:O