With no explanation, label each line with "O", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
1968
Olympic
football
tournament
was
played
as
part
of
the
1968
Summer
Olympics
.
The:O
1968:event-sportsevent
Olympic:event-sportsevent
football:event-sportsevent
tournament:event-sportsevent
was:O
played:O
as:O
part:O
of:O
the:O
1968:event-sportsevent
Summer:event-sportsevent
Olympics:event-sportsevent
.:O