With no explanation, label each line with "O", "organization-sportsteam", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
season
ended
with
Super
Bowl
IX
when
the
Pittsburgh
Steelers
defeated
the
Minnesota
Vikings
.
The:O
season:O
ended:O
with:O
Super:event-sportsevent
Bowl:event-sportsevent
IX:event-sportsevent
when:O
the:O
Pittsburgh:organization-sportsteam
Steelers:organization-sportsteam
defeated:O
the:O
Minnesota:organization-sportsteam
Vikings:organization-sportsteam
.:O