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
1950
World
Cup
was
the
only
tournament
not
to
stage
a
final
tie
,
replacing
knockout
rounds
with
two
group
phases
.
The:O
1950:event-sportsevent
World:event-sportsevent
Cup:event-sportsevent
was:O
the:O
only:O
tournament:O
not:O
to:O
stage:O
a:O
final:O
tie:O
,:O
replacing:O
knockout:O
rounds:O
with:O
two:O
group:O
phases:O
.:O