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
attack
took
place
at
9:45
pm
(
GMT+2
)
as
guests
were
departing
.
The:O
attack:O
took:O
place:O
at:O
9:45:O
pm:O
(:O
GMT+2:O
):O
as:O
guests:O
were:O
departing:O
.:O