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 ":".
The
concentration
of
strontium
ranges
from
40
to
60
micrograms
per
liter
,
and
there
is
an
unknown
concentration
of
barium
.
The:O
concentration:O
of:O
strontium:other-chemicalthing
ranges:O
from:O
40:O
to:O
60:O
micrograms:O
per:O
liter:O
,:O
and:O
there:O
is:O
an:O
unknown:O
concentration:O
of:O
barium:other-chemicalthing
.:O