With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Nitrocellulose
is
guncotton
,
the
first
replacement
propellant
for
gun
powder
in
firearms
.
Nitrocellulose:O
is:O
guncotton:O
,:O
the:O
first:O
replacement:O
propellant:O
for:O
gun:O
powder:O
in:O
firearms:O
.:O