With no explanation, label each line with "O", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
operates
scheduled
domestic
and
regional
flights
from
its
main
base
at
Sir
Seretse
Khama
International
Airport
.
It:O
operates:O
scheduled:O
domestic:O
and:O
regional:O
flights:O
from:O
its:O
main:O
base:O
at:O
Sir:location-other
Seretse:location-other
Khama:location-other
International:location-other
Airport:location-other
.:O