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 ":".
Polonium
is
also
used
in
nuclear
batteries
.
Polonium:other-chemicalthing
is:O
also:O
used:O
in:O
nuclear:O
batteries:O
.:O