With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
COLD-PCR
was
originally
described
by
Li
``
et
al
.
''
COLD-PCR:O
was:O
originally:O
described:O
by:O
Li:person-other
``:O
et:O
al:O
.:O
'':O