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 ":".
Emerson
was
called
to
the
bar
in
1831
.
Emerson:person-other
was:O
called:O
to:O
the:O
bar:O
in:O
1831:O
.:O