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 ":".
Between
the
graves
were
a
number
of
shallow
depressions
and
pits
that
were
filled
with
various
materials
(
such
as
food
remains
)
that
are
thought
to
have
been
part
of
the
burial
ceremony
.
Between:O
the:O
graves:O
were:O
a:O
number:O
of:O
shallow:O
depressions:O
and:O
pits:O
that:O
were:O
filled:O
with:O
various:O
materials:O
(:O
such:O
as:O
food:O
remains:O
):O
that:O
are:O
thought:O
to:O
have:O
been:O
part:O
of:O
the:O
burial:O
ceremony:O
.:O