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
bridge
was
used
as
a
diversionary
route
for
passenger
services
when
the
Severn
Tunnel
was
closed
for
engineering
work
.
The:O
bridge:O
was:O
used:O
as:O
a:O
diversionary:O
route:O
for:O
passenger:O
services:O
when:O
the:O
Severn:location-road/railway/highway/transit
Tunnel:location-road/railway/highway/transit
was:O
closed:O
for:O
engineering:O
work:O
.:O