With no explanation, label each line with "location-GPE", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Augustus
became
Grand
Duke
of
Oldenburg
in
1829
.
Augustus:person-other
became:O
Grand:O
Duke:O
of:O
Oldenburg:location-GPE
in:O
1829:O
.:O