With no explanation, label each line with "O", "event-election", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
This
page
contains
a
timeline
of
the
2004
U.S.
presidential
election
.
This:O
page:O
contains:O
a:O
timeline:O
of:O
the:O
2004:O
U.S.:event-election
presidential:event-election
election:event-election
.:O