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
Astra
400
was
designed
to
be
safe
to
fire
with
a
simple
blowback
action
unaided
by
any
breech-locking
devices
.
The:O
Astra:product-weapon
400:product-weapon
was:O
designed:O
to:O
be:O
safe:O
to:O
fire:O
with:O
a:O
simple:O
blowback:O
action:O
unaided:O
by:O
any:O
breech-locking:O
devices:O
.:O