With no explanation, label each line with "location-GPE", "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
``
Uusimaa
``
escorted
minelayer
on
1
December
1939
when
she
laid
mines
to
the
seaways
near
Kökar
and
Utö
.
``:O
Uusimaa:product-weapon
``:O
escorted:O
minelayer:O
on:O
1:O
December:O
1939:O
when:O
she:O
laid:O
mines:O
to:O
the:O
seaways:O
near:O
Kökar:location-GPE
and:O
Utö:location-GPE
.:O