With no explanation, label each line with "product-airplane", "O", "organization-other", "location-GPE", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
This
weakness
was
exploited
by
the
RAF
when
Bf
110s
were
flown
as
close
escort
to
German
bombers
during
the
Battle
of
Britain
.
This:O
weakness:O
was:O
exploited:O
by:O
the:O
RAF:organization-other
when:O
Bf:product-airplane
110s:product-airplane
were:O
flown:O
as:O
close:O
escort:O
to:O
German:location-GPE
bombers:O
during:O
the:O
Battle:event-attack/battle/war/militaryconflict
of:event-attack/battle/war/militaryconflict
Britain:event-attack/battle/war/militaryconflict
.:O