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 ":".
Thirteen
days
later
,
to
see
the
relief
efforts
,
they
traveled
to
the
affected
areas
.
Thirteen:O
days:O
later:O
,:O
to:O
see:O
the:O
relief:O
efforts:O
,:O
they:O
traveled:O
to:O
the:O
affected:O
areas:O
.:O