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 ":".
These
diaries
are
regarded
as
having
significant
historical
value
.
These:O
diaries:O
are:O
regarded:O
as:O
having:O
significant:O
historical:O
value:O
.:O