With no explanation, label each line with "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
With
the
Douglas
C-47
Dakota
,
another
aircraft
type
was
introduced
,
which
allowed
for
both
passenger
and
cargo
flights
.
With:O
the:O
Douglas:product-airplane
C-47:product-airplane
Dakota:product-airplane
,:O
another:O
aircraft:O
type:O
was:O
introduced:O
,:O
which:O
allowed:O
for:O
both:O
passenger:O
and:O
cargo:O
flights:O
.:O