With no explanation, label each line with "other-livingthing", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
However
aerial
patrols
have
limited
effectiveness
in
reducing
shark
attacks
.
However:O
aerial:O
patrols:O
have:O
limited:O
effectiveness:O
in:O
reducing:O
shark:other-livingthing
attacks:O
.:O