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 ":".
The
two
Kuwaiti
attackers
were
killed
after
U.S.
Marines
returned
fire
in
self-defense
.
The:O
two:O
Kuwaiti:location-GPE
attackers:O
were:O
killed:O
after:O
U.S.:organization-other
Marines:organization-other
returned:O
fire:O
in:O
self-defense:O
.:O