With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
practised
medicine
in
Paris
,
treating
mental
disorders
,
until
1868
,
when
he
retired
.
He:O
practised:O
medicine:O
in:O
Paris:location-GPE
,:O
treating:O
mental:O
disorders:O
,:O
until:O
1868:O
,:O
when:O
he:O
retired:O
.:O