With no explanation, label each line with "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
was
observed
in
the
Cassiopeia
A
supernova
remnant
and
SN
1987A
at
a
relatively
high
concentration
,
a
consequence
of
delayed
decay
resulting
from
ionizing
conditions
.
It:O
was:O
observed:O
in:O
the:O
Cassiopeia:other-astronomything
A:other-astronomything
supernova:O
remnant:O
and:O
SN:other-astronomything
1987A:other-astronomything
at:O
a:O
relatively:O
high:O
concentration:O
,:O
a:O
consequence:O
of:O
delayed:O
decay:O
resulting:O
from:O
ionizing:O
conditions:O
.:O