With no explanation, label each line with "O", "person-athlete", "organization-sportsteam", "organization-sportsleague", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
In
2013
,
the
Commandos
folded
,
and
Barnett
followed
head
coach
Billy
Back
to
the
Texas
Revolution
of
the
Indoor
Football
League
(
IFL
)
.
In:O
2013:O
,:O
the:O
Commandos:organization-sportsteam
folded:O
,:O
and:O
Barnett:person-athlete
followed:O
head:O
coach:O
Billy:person-athlete
Back:O
to:O
the:O
Texas:organization-sportsteam
Revolution:organization-sportsteam
of:O
the:O
Indoor:organization-sportsleague
Football:organization-sportsleague
League:organization-sportsleague
(:O
IFL:organization-sportsleague
):O
.:O