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 ":".
Tuna
schools
are
believed
to
associate
themselves
with
dolphins
for
protection
against
sharks
,
which
are
tuna
predators
.
Tuna:other-livingthing
schools:other-livingthing
are:O
believed:O
to:O
associate:O
themselves:O
with:O
dolphins:other-livingthing
for:O
protection:O
against:O
sharks:other-livingthing
,:O
which:O
are:O
tuna:other-livingthing
predators:O
.:O