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
large
cavern
tops
a
closed
lake
having
a
surface
area
of
300
square
meters
and
is
very
deep
.
The:O
large:O
cavern:O
tops:O
a:O
closed:O
lake:O
having:O
a:O
surface:O
area:O
of:O
300:O
square:O
meters:O
and:O
is:O
very:O
deep:O
.:O