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
investigate
insurance
fraud
involving
arson
,
and
more
recently
,
potential
terrorism
.
They:O
investigate:O
insurance:O
fraud:O
involving:O
arson:O
,:O
and:O
more:O
recently:O
,:O
potential:O
terrorism:O
.:O