With no explanation, label each line with "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Anti-submarine
armament
consisted
of
two
racks
for
anti-submarine
torpedoes
(
eight
torpedoes
were
carried
)
,
two
Hedgehog
anti-submarine
mortars
,
eight
depth-charge
throwers
and
two
depth-charge
racks
.
Anti-submarine:O
armament:O
consisted:O
of:O
two:O
racks:O
for:O
anti-submarine:O
torpedoes:O
(:O
eight:O
torpedoes:O
were:O
carried:O
):O
,:O
two:O
Hedgehog:product-weapon
anti-submarine:O
mortars:O
,:O
eight:O
depth-charge:O
throwers:O
and:O
two:O
depth-charge:O
racks:O
.:O