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 ":".
Lee
became
a
busy
guest
actor
in
the
1970s
,
appearing
on
``
Marcus
Welby
,
M.D
.
Lee:person-actor
became:O
a:O
busy:O
guest:O
actor:O
in:O
the:O
1970s:O
,:O
appearing:O
on:O
``:O
Marcus:O
Welby:O
,:O
M.D:O
.:O