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 ":".
In
1991
,
Kendler
et
al
.
In:O
1991:O
,:O
Kendler:person-other
et:O
al:O
.:O