With no explanation, label each line with "person-athlete", "organization-sportsleague", "event-sportsevent", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
Pat
Summerall
and
John
Madden
called
their
first
Super
Bowl
together
as
they
went
on
to
become
one
of
the
most
popular
NFL
announcing
teams
ever
.
Pat:person-athlete
Summerall:person-athlete
and:O
John:person-athlete
Madden:person-athlete
called:O
their:O
first:O
Super:event-sportsevent
Bowl:event-sportsevent
together:O
as:O
they:O
went:O
on:O
to:O
become:O
one:O
of:O
the:O
most:O
popular:O
NFL:organization-sportsleague
announcing:O
teams:O
ever:O
.:O