With no explanation, label each line with "O", "other-biologything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Nicotinamide
adenine
dinucleotide
(
NAD
)
is
a
cofactor
central
to
metabolism
.
Nicotinamide:other-biologything
adenine:other-biologything
dinucleotide:other-biologything
(:O
NAD:other-biologything
):O
is:O
a:O
cofactor:other-biologything
central:O
to:O
metabolism:O
.:O