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 ":".
Oslo
was
last
ravaged
in
1654
.
Oslo:location-GPE
was:O
last:O
ravaged:O
in:O
1654:O
.:O