With no explanation, label each line with "O", "organization-sportsleague", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Though
the
Players
'
League
folded
after
a
single
season
,
it
had
taken
its
toll
.
Though:O
the:O
Players:organization-sportsleague
':organization-sportsleague
League:organization-sportsleague
folded:O
after:O
a:O
single:O
season:O
,:O
it:O
had:O
taken:O
its:O
toll:O
.:O