With no explanation, label each line with "product-game", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
On
February
24
,
2011
,
the
company
announced
the
new
game
``
Orcs
Must
Die
!
``
.
On:O
February:O
24:O
,:O
2011:O
,:O
the:O
company:O
announced:O
the:O
new:O
game:O
``:O
Orcs:product-game
Must:product-game
Die:product-game
!:product-game
``:O
.:O