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
limestone
quarry
is
now
disused
but
can
be
seen
.
The:O
limestone:O
quarry:O
is:O
now:O
disused:O
but:O
can:O
be:O
seen:O
.:O