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 ":".
may
also
be
used
in
place
of
xylocaine
.
may:O
also:O
be:O
used:O
in:O
place:O
of:O
xylocaine:other-chemicalthing
.:O