With no explanation, label each line with "O", "event-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
Century
of
Progress
exhibition
was
a
rare
example
of
a
world
's
fair
that
not
only
repaid
all
its
investors
in
full
,
but
closed
with
a
surplus
.
The:O
Century:event-other
of:event-other
Progress:event-other
exhibition:event-other
was:O
a:O
rare:O
example:O
of:O
a:O
world:O
's:O
fair:O
that:O
not:O
only:O
repaid:O
all:O
its:O
investors:O
in:O
full:O
,:O
but:O
closed:O
with:O
a:O
surplus:O
.:O