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 ":".
In
industry
,
methanethiol
is
prepared
by
the
reaction
of
hydrogen
sulfide
with
methanol
.
In:O
industry:O
,:O
methanethiol:other-chemicalthing
is:O
prepared:O
by:O
the:O
reaction:O
of:O
hydrogen:other-chemicalthing
sulfide:other-chemicalthing
with:O
methanol:other-chemicalthing
.:O