With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
It
commenced
on
28
April
2007
and
ended
on
30
September
after
eighteen
races
.
It:O
commenced:O
on:O
28:O
April:O
2007:O
and:O
ended:O
on:O
30:O
September:O
after:O
eighteen:O
races:O
.:O