With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Halon
1301
is
the
primary
agent
used
in
commercial
aviation
engine
,
cargo
compartments
,
and
auxiliary
power
unit
fire
zones
.
Halon:other-chemicalthing
1301:other-chemicalthing
is:O
the:O
primary:O
agent:O
used:O
in:O
commercial:O
aviation:O
engine:O
,:O
cargo:O
compartments:O
,:O
and:O
auxiliary:O
power:O
unit:O
fire:O
zones:O
.:O