With no explanation, label each line with "location-GPE", "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Manhattan
-based
real
estate
company
Webb
and
Knapp
gained
a
controlling
interest
in
the
airfield
in
1950
and
later
built
light
factories
on
the
former
Unit
2
.
Manhattan:location-GPE
-based:O
real:O
estate:O
company:O
Webb:organization-company
and:organization-company
Knapp:organization-company
gained:O
a:O
controlling:O
interest:O
in:O
the:O
airfield:O
in:O
1950:O
and:O
later:O
built:O
light:O
factories:O
on:O
the:O
former:O
Unit:O
2:O
.:O