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
Hampton
Roads
Beltway
extends
on
a
long
loop
through
the
region
,
crossing
the
harbor
on
two
toll-free
bridge-tunnel
facilities
.
The:O
Hampton:location-road/railway/highway/transit
Roads:location-road/railway/highway/transit
Beltway:location-road/railway/highway/transit
extends:O
on:O
a:O
long:O
loop:O
through:O
the:O
region:O
,:O
crossing:O
the:O
harbor:O
on:O
two:O
toll-free:O
bridge-tunnel:O
facilities:O
.:O