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 ":".
Birds
use
the
plants
for
nesting
material
,
but
also
continue
to
assist
in
the
spreading
of
seeds
,
and
fertilize
the
soil
with
their
guano
.
Birds:O
use:O
the:O
plants:O
for:O
nesting:O
material:O
,:O
but:O
also:O
continue:O
to:O
assist:O
in:O
the:O
spreading:O
of:O
seeds:O
,:O
and:O
fertilize:O
the:O
soil:O
with:O
their:O
guano:O
.:O