With no explanation, label each line with "O", "other-biologything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Their
social
grouping
is
thus
extremely
close
,
which
is
also
partly
attributed
to
the
difficult
and
unusual
features
of
their
habitat
,
which
is
much
colder
than
the
habitats
of
other
bottlenose
groups
and
is
also
overlaid
by
the
freshwater
layer
.
Their:O
social:O
grouping:O
is:O
thus:O
extremely:O
close:O
,:O
which:O
is:O
also:O
partly:O
attributed:O
to:O
the:O
difficult:O
and:O
unusual:O
features:O
of:O
their:O
habitat:O
,:O
which:O
is:O
much:O
colder:O
than:O
the:O
habitats:O
of:O
other:O
bottlenose:other-biologything
groups:O
and:O
is:O
also:O
overlaid:O
by:O
the:O
freshwater:O
layer:O
.:O