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 ":".
Over
the
following
years
,
the
fleet
was
further
modernized
with
Boeing
707
aircraft
,
which
stayed
until
1988
.
Over:O
the:O
following:O
years:O
,:O
the:O
fleet:O
was:O
further:O
modernized:O
with:O
Boeing:product-airplane
707:product-airplane
aircraft:product-airplane
,:O
which:O
stayed:O
until:O
1988:O
.:O