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 ":".
It
is
also
referred
to
as
``
cellulose
nitrate
''
.
It:O
is:O
also:O
referred:O
to:O
as:O
``:O
cellulose:O
nitrate:O
'':O
.:O