With no explanation, label each line with "product-other", "O", "other-currency", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
After
World
War
II
,
the
Bretton
Woods
system
pegged
the
United
States
dollar
to
gold
at
a
rate
of
US
$
35
per
troy
ounce
.
After:O
World:event-attack/battle/war/militaryconflict
War:event-attack/battle/war/militaryconflict
II:event-attack/battle/war/militaryconflict
,:O
the:O
Bretton:product-other
Woods:product-other
system:O
pegged:O
the:O
United:other-currency
States:other-currency
dollar:other-currency
to:O
gold:O
at:O
a:O
rate:O
of:O
US:other-currency
$:other-currency
35:O
per:O
troy:O
ounce:O
.:O