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 ":".
The
gunner
's
seat
,
twin
Lewis
machine
gun
and
ammunition
were
contained
within
a
novel
turret
,
a
vertical
axis
cylinder
which
could
be
power
rotated
in
any
direction
under
lever
control
.
The:O
gunner:O
's:O
seat:O
,:O
twin:product-weapon
Lewis:product-weapon
machine:product-weapon
gun:product-weapon
and:O
ammunition:O
were:O
contained:O
within:O
a:O
novel:O
turret:O
,:O
a:O
vertical:O
axis:O
cylinder:O
which:O
could:O
be:O
power:O
rotated:O
in:O
any:O
direction:O
under:O
lever:O
control:O
.:O