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 ":".
Unit
1
was
installed
in
1964
and
retired
in
2011
.
Unit:O
1:O
was:O
installed:O
in:O
1964:O
and:O
retired:O
in:O
2011:O
.:O