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 ":".
The
audience
sat
in
portable
chairs
on
a
gravel
floor
.
The:O
audience:O
sat:O
in:O
portable:O
chairs:O
on:O
a:O
gravel:O
floor:O
.:O