With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
They
are
predaceous
and
some
species
are
known
to
swarm
but
little
is
known
of
their
life
history
.
They:O
are:O
predaceous:O
and:O
some:O
species:O
are:O
known:O
to:O
swarm:O
but:O
little:O
is:O
known:O
of:O
their:O
life:O
history:O
.:O