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
force
then
set
up
a
night
perimeter
.
The:O
force:O
then:O
set:O
up:O
a:O
night:O
perimeter:O
.:O