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
changed
in
1959–1960
.
This:O
changed:O
in:O
1959–1960:O
.:O