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 ":".
Key
conservation
groups
backed
the
plan
.
Key:O
conservation:O
groups:O
backed:O
the:O
plan:O
.:O