With no explanation, label each line with "O", "person-actor", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Dick
Clark
and
Leonard
Nimoy
guest
starred
as
themselves
.
Dick:person-actor
Clark:person-actor
and:O
Leonard:person-actor
Nimoy:person-actor
guest:O
starred:O
as:O
themselves:O
.:O