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 ":".
They
purchased
a
used
aircraft
and
operated
a
flight
school
,
aircraft
dealership
,
parts
distributor
and
air
taxi
operator
.
They:O
purchased:O
a:O
used:O
aircraft:O
and:O
operated:O
a:O
flight:O
school:O
,:O
aircraft:O
dealership:O
,:O
parts:O
distributor:O
and:O
air:O
taxi:O
operator:O
.:O