With no explanation, label each line with "O", "location-road/railway/highway/transit", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
station
saw
several
accidents
,
and
was
closed
on
5
May
1992
when
the
Sognsvann
Line
was
upgraded
to
rapid
transit
standard
.
The:O
station:O
saw:O
several:O
accidents:O
,:O
and:O
was:O
closed:O
on:O
5:O
May:O
1992:O
when:O
the:O
Sognsvann:location-road/railway/highway/transit
Line:location-road/railway/highway/transit
was:O
upgraded:O
to:O
rapid:O
transit:O
standard:O
.:O