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 ":".
Other
safe
solvents
to
use
include
propylene
carbonate
,
which
is
safer
than
ethylacetate
but
is
difficult
to
purchase
commercially
.
Other:O
safe:O
solvents:O
to:O
use:O
include:O
propylene:other-chemicalthing
carbonate:other-chemicalthing
,:O
which:O
is:O
safer:O
than:O
ethylacetate:other-chemicalthing
but:O
is:O
difficult:O
to:O
purchase:O
commercially:O
.:O