With no explanation, label each line with "O", "organization-company", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
For
defence
against
enemy
aircraft
,
on
top
of
the
cabin
were
two
aircraft-style
turrets
made
by
Armstrong-Whitworth
initially
with
a
single
.303
in
Vickers
K
gun
or
Lewis
gun
(
this
was
later
improved
–
see
Variants
below
)
.
For:O
defence:O
against:O
enemy:O
aircraft:O
,:O
on:O
top:O
of:O
the:O
cabin:O
were:O
two:O
aircraft-style:product-weapon
turrets:product-weapon
made:O
by:O
Armstrong-Whitworth:organization-company
initially:O
with:O
a:O
single:O
.303:product-weapon
in:product-weapon
Vickers:product-weapon
K:product-weapon
gun:product-weapon
or:O
Lewis:product-weapon
gun:product-weapon
(:O
this:O
was:O
later:O
improved:O
–:O
see:O
Variants:O
below:O
):O
.:O