With no explanation, label each line with "product-airplane", "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
airplane
was
a
Curtiss
SB2C
Helldiver
that
had
ditched
in
the
reservoir
because
of
engine
failure
while
conducting
dive
bombing
practice
toward
the
end
of
World
War
II
.
The:O
airplane:O
was:O
a:O
Curtiss:product-airplane
SB2C:product-airplane
Helldiver:product-airplane
that:O
had:O
ditched:O
in:O
the:O
reservoir:O
because:O
of:O
engine:O
failure:O
while:O
conducting:O
dive:O
bombing:O
practice:O
toward:O
the:O
end:O
of:O
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
II:event-attack/battle/war/militaryconflict
.:O