With no explanation, label each line with "location-GPE", "organization-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
RAAF
crews
began
training
in
the
U.S
.
in
2009
.
RAAF:organization-other
crews:O
began:O
training:O
in:O
the:O
U.S:location-GPE
.:location-GPE
in:O
2009:O
.:O