With no explanation, label each line with "location-GPE", "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
This
is
a
list
of
fighter
aces
in
World
War
II
from
Denmark
.
This:O
is:O
a:O
list:O
of:O
fighter:O
aces:O
in:O
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
II:event-attack/battle/war/militaryconflict
from:O
Denmark:location-GPE
.:O