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 ":".
It
was
commissioned
in
Dec.
1991
.
It:O
was:O
commissioned:O
in:O
Dec.:O
1991:O
.:O