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 ":".
Before
coaching
,
Back
played
six
seasons
in
the
NIFL
,
af2
,
and
IFL
.
Before:O
coaching:O
,:O
Back:person-other
played:O
six:O
seasons:O
in:O
the:O
NIFL:organization-sportsleague
,:O
af2:organization-sportsleague
,:O
and:O
IFL:organization-sportsleague
.:O