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 ":".
Pyridine
can
also
be
used
however
this
is
less
safe
than
ethylacetate
and
propylene
carbonate
.
Pyridine:other-chemicalthing
can:O
also:O
be:O
used:O
however:O
this:O
is:O
less:O
safe:O
than:O
ethylacetate:other-chemicalthing
and:O
propylene:other-chemicalthing
carbonate:other-chemicalthing
.:O