With no explanation, label each line with "product-airplane", "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Ryan
International
Airlines
was
also
unaware
of
these
accidents
when
they
purchased
the
DC-9
s
.
Ryan:organization-company
International:organization-company
Airlines:organization-company
was:O
also:O
unaware:O
of:O
these:O
accidents:O
when:O
they:O
purchased:O
the:O
DC-9:product-airplane
s:O
.:O