With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Because
of
malabsorption
,
serum
levels
of
cyanocobalamin
(
vitamin
B12
)
and
tocopherol
(
vitamin
E
)
may
be
low
.
Because:O
of:O
malabsorption:O
,:O
serum:O
levels:O
of:O
cyanocobalamin:other-chemicalthing
(:O
vitamin:other-chemicalthing
B12:other-chemicalthing
):O
and:O
tocopherol:other-chemicalthing
(:O
vitamin:other-chemicalthing
E:other-chemicalthing
):O
may:O
be:O
low:O
.:O