With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
A
number
of
military
air
bases
also
have
a
civil
enclave
for
commercial
passenger
flights
,
e.g
.
A:O
number:O
of:O
military:O
air:O
bases:O
also:O
have:O
a:O
civil:O
enclave:O
for:O
commercial:O
passenger:O
flights:O
,:O
e.g:O
.:O