With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
was
owned
by
William
Rockefeller
's
family
.
He:O
was:O
owned:O
by:O
William:person-other
Rockefeller:person-other
's:O
family:O
.:O