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 ":".
Salmonellae
metabolise
thiosulfate
to
produce
hydrogen
sulfide
,
which
leads
to
the
formation
of
colonies
with
black
centers
and
allows
them
to
be
differentiated
from
the
similarly
coloured
``
Shigella
``
colonies
.
Salmonellae:O
metabolise:O
thiosulfate:O
to:O
produce:O
hydrogen:O
sulfide:O
,:O
which:O
leads:O
to:O
the:O
formation:O
of:O
colonies:O
with:O
black:O
centers:O
and:O
allows:O
them:O
to:O
be:O
differentiated:O
from:O
the:O
similarly:O
coloured:O
``:O
Shigella:other-chemicalthing
``:O
colonies:O
.:O