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 ":".
However
,
study
of
the
character
of
the
terrain
repeatedly
caused
the
project
to
be
rejected
.
However:O
,:O
study:O
of:O
the:O
character:O
of:O
the:O
terrain:O
repeatedly:O
caused:O
the:O
project:O
to:O
be:O
rejected:O
.:O