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
experiment
proved
unsuccessful
and
no
additional
units
were
rebuilt
.
The:O
experiment:O
proved:O
unsuccessful:O
and:O
no:O
additional:O
units:O
were:O
rebuilt:O
.:O