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 ":".
Farrar
retired
from
opera
in
1922
at
the
age
of
40
.
Farrar:person-actor
retired:O
from:O
opera:O
in:O
1922:O
at:O
the:O
age:O
of:O
40:O
.:O