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
isotactic
polymer
can
be
produced
from
optically
active
propylene
oxide
,
but
at
a
high
cost
.
The:O
isotactic:O
polymer:O
can:O
be:O
produced:O
from:O
optically:O
active:O
propylene:other-chemicalthing
oxide:other-chemicalthing
,:O
but:O
at:O
a:O
high:O
cost:O
.:O