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
ridge
runs
north-south
for
approximately
30
miles
.
The:O
ridge:O
runs:O
north-south:O
for:O
approximately:O
30:O
miles:O
.:O