With no explanation, label each line with "O", "location-road/railway/highway/transit", "organization-other", "location-GPE", "product-car", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
Officers
from
the
Metropolitan
Police
were
sitting
in
their
Rover
SD1
3.5
patrol
cars
at
J7
of
the
M11
just
outside
Harlow
,
Essex
.
Officers:O
from:O
the:O
Metropolitan:organization-other
Police:organization-other
were:O
sitting:O
in:O
their:O
Rover:product-car
SD1:product-car
3.5:O
patrol:O
cars:O
at:O
J7:O
of:O
the:O
M11:location-road/railway/highway/transit
just:O
outside:O
Harlow:location-GPE
,:O
Essex:location-GPE
.:O