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 ":".
It
is
essential
in
humans
,
meaning
the
body
can
not
synthesize
it
,
and
must
be
ingested
in
our
diet
.
It:O
is:O
essential:O
in:O
humans:O
,:O
meaning:O
the:O
body:O
can:O
not:O
synthesize:O
it:O
,:O
and:O
must:O
be:O
ingested:O
in:O
our:O
diet:O
.:O