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 ":".
However
,
this
story
has
been
debunked
by
several
sources
.
However:O
,:O
this:O
story:O
has:O
been:O
debunked:O
by:O
several:O
sources:O
.:O