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
region
was
not
thought
to
contain
globular
clusters
.
This:O
region:O
was:O
not:O
thought:O
to:O
contain:O
globular:O
clusters:O
.:O