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
opening
dance
night
saw
approximately
700
couples
attend
.
The:O
opening:O
dance:O
night:O
saw:O
approximately:O
700:O
couples:O
attend:O
.:O