With no explanation, label each line with "product-airplane", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Design
of
the
Cygnus
started
in
April
1970
in
the
Department
of
Mechanical
Engineering
,
building
the
aircraft
started
in
June
1970
,
the
Cygnus
flew
for
the
first
time
on
16
December
1971
.
Design:O
of:O
the:O
Cygnus:product-airplane
started:O
in:O
April:O
1970:O
in:O
the:O
Department:organization-other
of:organization-other
Mechanical:organization-other
Engineering:organization-other
,:O
building:O
the:O
aircraft:O
started:O
in:O
June:O
1970:O
,:O
the:O
Cygnus:product-airplane
flew:O
for:O
the:O
first:O
time:O
on:O
16:O
December:O
1971:O
.:O