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 ":".
This
visit
drew
20,000
people
.
This:O
visit:O
drew:O
20,000:O
people:O
.:O