With no explanation, label each line with "product-airplane", "O", "organization-company", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
The
Lockheed
R6V
Constitution
was
a
large
,
propeller-driven
,
double-decker
transport
aircraft
developed
in
the
1940s
by
Lockheed
as
a
long-range
,
high-capacity
transport
and
airliner
for
the
U.S.
Navy
and
Pan
American
Airways
.
The:O
Lockheed:product-airplane
R6V:product-airplane
Constitution:product-airplane
was:O
a:O
large:O
,:O
propeller-driven:O
,:O
double-decker:O
transport:O
aircraft:O
developed:O
in:O
the:O
1940s:O
by:O
Lockheed:organization-company
as:O
a:O
long-range:O
,:O
high-capacity:O
transport:O
and:O
airliner:O
for:O
the:O
U.S.:organization-government/governmentagency
Navy:organization-government/governmentagency
and:O
Pan:organization-company
American:organization-company
Airways:organization-company
.:O