With no explanation, label each line with "O", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
was
then
thrown
into
the
Tiber
.
It:O
was:O
then:O
thrown:O
into:O
the:O
Tiber:location-other
.:O