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 ":".
The
bones
of
the
soldiers
killed
in
the
battle
were
visible
to
passers-by
for
years
after
the
battle
.
The:O
bones:O
of:O
the:O
soldiers:O
killed:O
in:O
the:O
battle:O
were:O
visible:O
to:O
passers-by:O
for:O
years:O
after:O
the:O
battle:O
.:O