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 ":".
When
Smut
s
died
in
1950
,
Lettow-Vorbeck
sent
his
widow
a
letter
expressing
his
sympathy
for
her
loss
.
When:O
Smut:person-other
s:O
died:O
in:O
1950:O
,:O
Lettow-Vorbeck:person-other
sent:O
his:O
widow:O
a:O
letter:O
expressing:O
his:O
sympathy:O
for:O
her:O
loss:O
.:O