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
proposal
was
accepted
and
a
treaty
was
signed
.
This:O
proposal:O
was:O
accepted:O
and:O
a:O
treaty:O
was:O
signed:O
.:O