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 ":".
In
1902
the
top
players
in
the
area
,
mainly
from
the
Duquesne
Country
and
Athletic
Club
line-up
,
formed
the
Pittsburgh
Stars
of
the
first
National
Football
League
.
In:O
1902:O
the:O
top:O
players:O
in:O
the:O
area:O
,:O
mainly:O
from:O
the:O
Duquesne:organization-sportsteam
Country:organization-sportsteam
and:O
Athletic:organization-sportsteam
Club:organization-sportsteam
line-up:O
,:O
formed:O
the:O
Pittsburgh:organization-sportsteam
Stars:organization-sportsteam
of:O
the:O
first:O
National:event-sportsevent
Football:event-sportsevent
League:event-sportsevent
.:O