With no explanation, label each line with "O", "product-food", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Historical
documents
show
that
in
the
13th
and
14th
centuries
,
Parmigiano
was
already
very
similar
to
that
produced
today
,
which
suggests
its
origins
can
be
traced
to
far
earlier
.
Historical:O
documents:O
show:O
that:O
in:O
the:O
13th:O
and:O
14th:O
centuries:O
,:O
Parmigiano:product-food
was:O
already:O
very:O
similar:O
to:O
that:O
produced:O
today:O
,:O
which:O
suggests:O
its:O
origins:O
can:O
be:O
traced:O
to:O
far:O
earlier:O
.:O