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 ":".
Until
the
announcement
is
made
any
bidder
may
retract
his
bid
”
.
Until:O
the:O
announcement:O
is:O
made:O
any:O
bidder:O
may:O
retract:O
his:O
bid:O
”:O
.:O