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
Barrett
M90
still
remains
very
popular
because
of
its
bullpup
design
and
light
weight
.
The:O
Barrett:product-weapon
M90:product-weapon
still:O
remains:O
very:O
popular:O
because:O
of:O
its:O
bullpup:O
design:O
and:O
light:O
weight:O
.:O