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 ":".
By
the
early
seventies
,
he
had
taken
to
managing
his
team
,
entering
several
cars
in
World
Sportscar
Championship
events
,
and
taking
a
backseat
to
driving
.
By:O
the:O
early:O
seventies:O
,:O
he:O
had:O
taken:O
to:O
managing:O
his:O
team:O
,:O
entering:O
several:O
cars:O
in:O
World:event-sportsevent
Sportscar:event-sportsevent
Championship:event-sportsevent
events:O
,:O
and:O
taking:O
a:O
backseat:O
to:O
driving:O
.:O