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 ":".
But
it
took
until
1771
to
realize
this
.
But:O
it:O
took:O
until:O
1771:O
to:O
realize:O
this:O
.:O