With no explanation, label each line with "O", "location-road/railway/highway/transit", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
It
is
served
by
the
Fredericksburg
Line
and
Manassas
Line
of
the
Virginia
Railway
Express
system
.
It:O
is:O
served:O
by:O
the:O
Fredericksburg:location-road/railway/highway/transit
Line:location-road/railway/highway/transit
and:O
Manassas:location-road/railway/highway/transit
Line:location-road/railway/highway/transit
of:O
the:O
Virginia:organization-other
Railway:organization-other
Express:organization-other
system:O
.:O