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
bomb
racks
in
the
engine
nacelles
were
eliminated
entirely
,
as
was
the
fixed
ShKAS
machine
gun
in
the
tail
.
The:O
bomb:O
racks:O
in:O
the:O
engine:O
nacelles:O
were:O
eliminated:O
entirely:O
,:O
as:O
was:O
the:O
fixed:O
ShKAS:product-weapon
machine:product-weapon
gun:product-weapon
in:O
the:O
tail:O
.:O