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
was
originally
opened
on
7
December
1869
,
when
the
first
section
of
the
East
London
Railway
was
opened
.
The:O
station:O
was:O
originally:O
opened:O
on:O
7:O
December:O
1869:O
,:O
when:O
the:O
first:O
section:O
of:O
the:O
East:location-road/railway/highway/transit
London:location-road/railway/highway/transit
Railway:location-road/railway/highway/transit
was:O
opened:O
.:O