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 ":".
At
this
time
,
its
load
factors
were
less
than
50
per
cent
.
At:O
this:O
time:O
,:O
its:O
load:O
factors:O
were:O
less:O
than:O
50:O
per:O
cent:O
.:O