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 ":".
The
flight
was
the
target
of
a
failed
al-Qaeda
bombing
attempt
on
Christmas
Day
,
December
25
,
2009
,
in
which
a
passenger
tried
to
set
off
chemical
explosives
sewn
to
his
underwear
.
The:O
flight:O
was:O
the:O
target:O
of:O
a:O
failed:O
al-Qaeda:O
bombing:O
attempt:O
on:O
Christmas:O
Day:O
,:O
December:O
25:O
,:O
2009:O
,:O
in:O
which:O
a:O
passenger:O
tried:O
to:O
set:O
off:O
chemical:O
explosives:O
sewn:O
to:O
his:O
underwear:O
.:O