With no explanation, label each line with "O", "person-scholar", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Richards
is
a
cancer
specialist
.
Richards:person-scholar
is:O
a:O
cancer:O
specialist:O
.:O