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
the
time
of
purchase
,
there
were
61
corporate
owned
stores
.
At:O
the:O
time:O
of:O
purchase:O
,:O
there:O
were:O
61:O
corporate:O
owned:O
stores:O
.:O