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 ":".
Previously
,
3
group
matches
of
Group
A
and
B
took
place
in
the
stadium
during
the
UEFA
Euro
2004
.
Previously:O
,:O
3:O
group:O
matches:O
of:O
Group:O
A:O
and:O
B:O
took:O
place:O
in:O
the:O
stadium:O
during:O
the:O
UEFA:event-sportsevent
Euro:event-sportsevent
2004:O
.:O