With no explanation, label each line with "O", "building-restaurant", "product-food", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Peking
duck
is
originally
roasted
in
a
closed
oven
(
)
,
and
Bianyifang
is
the
restaurant
that
keeps
this
tradition
.
Peking:product-food
duck:product-food
is:O
originally:O
roasted:O
in:O
a:O
closed:O
oven:O
(:O
):O
,:O
and:O
Bianyifang:building-restaurant
is:O
the:O
restaurant:O
that:O
keeps:O
this:O
tradition:O
.:O