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
catalysts
generally
consist
of
cobalt
and
nickel
as
well
as
molybdenum
disulfide
or
less
often
tungsten
disulfide
supported
on
alumina
.
The:O
catalysts:O
generally:O
consist:O
of:O
cobalt:other-chemicalthing
and:O
nickel:other-chemicalthing
as:O
well:O
as:O
molybdenum:other-chemicalthing
disulfide:other-chemicalthing
or:O
less:O
often:O
tungsten:other-chemicalthing
disulfide:other-chemicalthing
supported:O
on:O
alumina:other-chemicalthing
.:O