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 ":".
Carbon
monoxide
detectors
–
Carbon
monoxide
(
CO
)
detectors
located
in
key
areas
inside
the
home
is
a
preventative
measure
against
CO
poisoning
.
Carbon:other-chemicalthing
monoxide:other-chemicalthing
detectors:O
–:O
Carbon:other-chemicalthing
monoxide:other-chemicalthing
(:O
CO:other-chemicalthing
):O
detectors:O
located:O
in:O
key:O
areas:O
inside:O
the:O
home:O
is:O
a:O
preventative:O
measure:O
against:O
CO:other-chemicalthing
poisoning:O
.:O