With no explanation, label each line with "O", "other-currency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
contestant
could
then
stop
and
take
the
$
50,000
or
risk
it
for
a
try
at
the
second
green
dollar
sign
.
The:O
contestant:O
could:O
then:O
stop:O
and:O
take:O
the:O
$:other-currency
50,000:other-currency
or:O
risk:O
it:O
for:O
a:O
try:O
at:O
the:O
second:O
green:O
dollar:O
sign:O
.:O