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 ":".
In
the
buildup
to
World
War
II
,
the
company
developed
its
own
biplane
trainer
the
St.
Louis
PT-35
,
which
lost
to
the
Boeing
Stearman
.
In:O
the:O
buildup:O
to:O
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
II:event-attack/battle/war/militaryconflict
,:O
the:O
company:O
developed:O
its:O
own:O
biplane:O
trainer:O
the:O
St.:product-airplane
Louis:product-airplane
PT-35:product-airplane
,:O
which:O
lost:O
to:O
the:O
Boeing:product-airplane
Stearman:product-airplane
.:O