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
was
the
largest
exhibit
area
until
early
2007
,
when
the
room
was
divided
in
half
.
This:O
was:O
the:O
largest:O
exhibit:O
area:O
until:O
early:O
2007:O
,:O
when:O
the:O
room:O
was:O
divided:O
in:O
half:O
.:O