With no explanation, label each line with "O", "location-other", "product-ship", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
On
29
June
1968
,
``
Requin
``
was
reclassified
AGSS-481
and
in
October
1968
she
began
inactivation
at
Naval
Station
Norfolk
.
On:O
29:O
June:O
1968:O
,:O
``:O
Requin:product-ship
``:O
was:O
reclassified:O
AGSS-481:product-ship
and:O
in:O
October:O
1968:O
she:O
began:O
inactivation:O
at:O
Naval:location-other
Station:location-other
Norfolk:location-other
.:O