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 ":".
Nitric
oxide
is
released
as
Cu
is
oxidized
to
state
(
II
)
and
returns
to
the
resting
configuration
.
Nitric:other-chemicalthing
oxide:other-chemicalthing
is:O
released:O
as:O
Cu:other-chemicalthing
is:O
oxidized:O
to:O
state:O
(:O
II:O
):O
and:O
returns:O
to:O
the:O
resting:O
configuration:O
.:O