With no explanation, label each line with "O", "organization-sportsleague", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Harrell
was
a
wide
receiver
in
the
National
Football
League
(
NFL
)
,
World
League
of
American
Football
(
WLAF
)
and
Canadian
Football
League
(
CFL
)
for
three
seasons
during
the
1990s
.
Harrell:person-other
was:O
a:O
wide:O
receiver:O
in:O
the:O
National:organization-sportsleague
Football:organization-sportsleague
League:organization-sportsleague
(:O
NFL:organization-sportsleague
):O
,:O
World:organization-sportsleague
League:organization-sportsleague
of:organization-sportsleague
American:organization-sportsleague
Football:organization-sportsleague
(:O
WLAF:organization-sportsleague
):O
and:O
Canadian:organization-sportsleague
Football:organization-sportsleague
League:organization-sportsleague
(:O
CFL:organization-sportsleague
):O
for:O
three:O
seasons:O
during:O
the:O
1990s:O
.:O