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 ":".
Conversely
,
all
three
may
derive
from
an
earlier
,
now
lost
source
.
Conversely:O
,:O
all:O
three:O
may:O
derive:O
from:O
an:O
earlier:O
,:O
now:O
lost:O
source:O
.:O