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 ":".
It
was
a
compact
double-action
blowback
design
in
.
32
ACP
.
It:O
was:O
a:O
compact:O
double-action:O
blowback:O
design:O
in:O
.:O
32:product-weapon
ACP:product-weapon
.:O