With no explanation, label each line with "product-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
stone
is
not
actually
marble
,
it
is
a
highly
polished
form
of
Black
Limestone
.
The:O
stone:O
is:O
not:O
actually:O
marble:O
,:O
it:O
is:O
a:O
highly:O
polished:O
form:O
of:O
Black:product-other
Limestone:product-other
.:O