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 ":".
Their
number
increased
to
forty
in
1855
.
Their:O
number:O
increased:O
to:O
forty:O
in:O
1855:O
.:O