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 ":".
Tryptone
is
the
assortment
of
peptides
formed
by
the
digestion
of
casein
by
the
protease
trypsin
.
Tryptone:other-biologything
is:O
the:O
assortment:O
of:O
peptides:other-biologything
formed:O
by:O
the:O
digestion:O
of:O
casein:other-biologything
by:O
the:O
protease:O
trypsin:O
.:O