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 ":".
Thirty-five
were
built
and
supplied
from
1920
.
Thirty-five:O
were:O
built:O
and:O
supplied:O
from:O
1920:O
.:O