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 ":".
This
arrangement
lasted
until
1991
.
This:O
arrangement:O
lasted:O
until:O
1991:O
.:O